* Add tests

* Add security-related tests

My first (unpublished) attempt at fixing the issues introduced (extremely
hard-to-exploit) security vulnerabilities, addressing them in a test.

* Fix authentication failures after going halfway through a sign-in attempt

* Refactor `authenticate_with_sign_in_token` and `authenticate_with_two_factor` to make the two authentication steps more obvious

When using a CAS server, the users only have a temporary email
`change@me-foo-cas.com` which can't be changed but by an
administrator.

We need a new environment variable like for SAML to assume the email
from CAS is verified.

* config/initializers/omniauth.rb: define CAS option for assuming
  email are always verified.
* .env.nanobox: add new variable as an example.

Bumps [rails](https://github.com/rails/rails) from 6.1.4 to 6.1.4.1.
- [Release notes](https://github.com/rails/rails/releases)
- [Commits](https://github.com/rails/rails/compare/v6.1.4...v6.1.4.1

)

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The addition of authentication history broke the omniauth login with
the following error:

  method=GET path=/auth/auth/cas/callback format=html
  controller=Auth::OmniauthCallbacksController action=cas status=500
  error='NameError: undefined local variable or method `user' for
  #<Auth::OmniauthCallbacksController:0x00000000036290>
  Did you mean?  @user' duration=435.93 view=0.00 db=36.19

* app/controllers/auth/omniauth_callbacks_controller.rb: fix variable
  name to `@user`

Bumps [eslint-plugin-import](https://github.com/import-js/eslint-plugin-import) from 2.24.0 to 2.24.1.
- [Release notes](https://github.com/import-js/eslint-plugin-import/releases)
- [Changelog](https://github.com/import-js/eslint-plugin-import/blob/master/CHANGELOG.md)
- [Commits](https://github.com/import-js/eslint-plugin-import/compare/v2.24.0...v2.24.1

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Bumps [ws](https://github.com/websockets/ws) from 8.1.0 to 8.2.0.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](https://github.com/websockets/ws/compare/8.1.0...8.2.0

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Bumps [@babel/plugin-transform-runtime](https://github.com/babel/babel/tree/HEAD/packages/babel-plugin-transform-runtime) from 7.14.5 to 7.15.0.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.15.0/packages/babel-plugin-transform-runtime

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By default, it'll only send those headers when the response code is one of the following:
- 200, 201, 204, 206, 301, 302, 303, 304, 307 & 308

As all the traffics should be https, the http protocol only exists to do 301 redirect,
and always send the HSTS header is almost one of the best practices, we should set
nginx to do so.

Reference:
- https://nginx.org/en/docs/http/ngx_http_headers_module.html#add_header
- https://ssl-config.mozilla.org/

* Add tests for SuspendAccountService

* Add tests for UnsuspendAccountService

Bumps [rspec-rails](https://github.com/rspec/rspec-rails) from 5.0.1 to 5.0.2.
- [Release notes](https://github.com/rspec/rspec-rails/releases)
- [Changelog](https://github.com/rspec/rspec-rails/blob/main/Changelog.md)
- [Commits](https://github.com/rspec/rspec-rails/compare/v5.0.1...v5.0.2

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Bumps [sass](https://github.com/sass/dart-sass) from 1.37.0 to 1.38.0.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sass/dart-sass/compare/1.37.0...1.38.0

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Bumps [fast_blank](https://github.com/SamSaffron/fast_blank) from 1.0.0 to 1.0.1.
- [Release notes](https://github.com/SamSaffron/fast_blank/releases)
- [Commits](https://github.com/SamSaffron/fast_blank/compare/1.0.0...v1.0.1

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It's default turned on, but it's better to turn it off for security reason.

Reference:
- https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets
- https://github.com/mozilla/server-side-tls/issues/135

* Fix remotely-suspended accounts' toots being merged back into timelines

* Mark remotely-deleted accounts as remotely suspended

Fix issue #16603 undefined method `serialize_payload' for Unsuspend Account Service error.
It seems that this service forgot to `include Payloadable` so that `serialize_payload` could not be found in this service.

Bumps [oj](https://github.com/ohler55/oj) from 3.12.2 to 3.13.2.
- [Release notes](https://github.com/ohler55/oj/releases)
- [Changelog](https://github.com/ohler55/oj/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/ohler55/oj/compare/v3.12.2...v3.13.2

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Bumps [eslint-plugin-import](https://github.com/import-js/eslint-plugin-import) from 2.23.4 to 2.24.0.
- [Release notes](https://github.com/import-js/eslint-plugin-import/releases)
- [Changelog](https://github.com/import-js/eslint-plugin-import/blob/master/CHANGELOG.md)
- [Commits](https://github.com/import-js/eslint-plugin-import/compare/v2.23.4...v2.24.0

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Bumps [yargs](https://github.com/yargs/yargs) from 17.0.1 to 17.1.1.
- [Release notes](https://github.com/yargs/yargs/releases)
- [Changelog](https://github.com/yargs/yargs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/yargs/yargs/compare/v17.0.1...v17.1.1

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Bumps [ws](https://github.com/websockets/ws) from 8.0.0 to 8.1.0.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](https://github.com/websockets/ws/compare/8.0.0...8.1.0

)

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Bumps [bullet](https://github.com/flyerhzm/bullet) from 6.1.4 to 6.1.5.
- [Release notes](https://github.com/flyerhzm/bullet/releases)
- [Changelog](https://github.com/flyerhzm/bullet/blob/master/CHANGELOG.md)
- [Commits](https://github.com/flyerhzm/bullet/compare/6.1.4...6.1.5

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Bumps [fastimage](https://github.com/sdsykes/fastimage) from 2.2.4 to 2.2.5.
- [Release notes](https://github.com/sdsykes/fastimage/releases)
- [Changelog](https://github.com/sdsykes/fastimage/blob/master/CHANGELOG)
- [Commits](https://github.com/sdsykes/fastimage/compare/v2.2.4...v2.2.5

)

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Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.12.2 to 1.12.3.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.12.2...v1.12.3

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Bumps [blurhash](https://github.com/woltapp/blurhash) from 1.1.3 to 1.1.4.
- [Release notes](https://github.com/woltapp/blurhash/releases)
- [Commits](https://github.com/woltapp/blurhash/commits

)

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Bumps [pundit](https://github.com/varvet/pundit) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/varvet/pundit/releases)
- [Changelog](https://github.com/varvet/pundit/blob/master/CHANGELOG.md)
- [Commits](https://github.com/varvet/pundit/compare/v2.1.0...v2.1.1

)

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Bumps [path-parse](https://github.com/jbgutierrez/path-parse) from 1.0.6 to 1.0.7.
- [Release notes](https://github.com/jbgutierrez/path-parse/releases)
- [Commits](https://github.com/jbgutierrez/path-parse/commits/v1.0.7

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Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 3.7.0 to 3.7.1.
- [Release notes](https://github.com/grosser/parallel_tests/releases)
- [Changelog](https://github.com/grosser/parallel_tests/blob/master/CHANGELOG.md)
- [Commits](https://github.com/grosser/parallel_tests/compare/v3.7.0...v3.7.1

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Bumps [aws-sdk-s3](https://github.com/aws/aws-sdk-ruby) from 1.98.0 to 1.99.0.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/version-3/gems/aws-sdk-s3/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/commits

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Bumps [webmock](https://github.com/bblimke/webmock) from 3.13.0 to 3.14.0.
- [Release notes](https://github.com/bblimke/webmock/releases)
- [Changelog](https://github.com/bblimke/webmock/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bblimke/webmock/compare/v3.13.0...v3.14.0

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Bumps [redux](https://github.com/reduxjs/redux) from 4.1.0 to 4.1.1.
- [Release notes](https://github.com/reduxjs/redux/releases)
- [Changelog](https://github.com/reduxjs/redux/blob/master/CHANGELOG.md)
- [Commits](https://github.com/reduxjs/redux/compare/v4.1.0...v4.1.1

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Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.18.4 to 1.19.0.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop/compare/v1.18.4...v1.19.0

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Bumps [strong_migrations](https://github.com/ankane/strong_migrations) from 0.7.7 to 0.7.8.
- [Release notes](https://github.com/ankane/strong_migrations/releases)
- [Changelog](https://github.com/ankane/strong_migrations/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/strong_migrations/compare/v0.7.7...v0.7.8

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Bumps [@babel/runtime](https://github.com/babel/babel/tree/HEAD/packages/babel-runtime) from 7.14.8 to 7.15.3.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.15.3/packages/babel-runtime

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Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.14.8 to 7.15.0.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.15.0/packages/babel-core

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Bumps [@testing-library/react](https://github.com/testing-library/react-testing-library) from 11.2.7 to 12.0.0.
- [Release notes](https://github.com/testing-library/react-testing-library/releases)
- [Changelog](https://github.com/testing-library/react-testing-library/blob/main/CHANGELOG.md)
- [Commits](https://github.com/testing-library/react-testing-library/compare/v11.2.7...v12.0.0

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* Refactor AttachmentList

* Do not crash if a notification contains an unprocessed media attachment

Fixes #16530

* Fix spacing in compact form

Fixes #16571

* Fix followers synchronization mechanism not working when URI has empty path

To my knowledge, there is no current implementation on the fediverse
that can use bare domains (e.g., actor is at https://example.org instead of
something like https://example.org/actor) that also plans to support the
followers synchronization mechanism. However, Mastodon's current implementation
would exclude such accounts from followers list.

Also adds tests and rename them to reflect the proper method names.

* Move url prefix regexp to its own constant