Add a confirmation screen when suspending a domain (#25144)

app/controllers/admin/domain_blocks_controller.rb

app/javascript/mastodon/components/admin/ImpactReport.jsx

app/javascript/mastodon/locales/en.json

app/javascript/styles/mastodon/admin.scss

app/lib/admin/metrics/measure/instance_accounts_measure.rb

app/lib/admin/metrics/measure/instance_followers_measure.rb

app/lib/admin/metrics/measure/instance_follows_measure.rb

...min/metrics/measure/instance_media_attachments_measure.rb

app/lib/admin/metrics/measure/instance_reports_measure.rb

app/lib/admin/metrics/measure/instance_statuses_measure.rb

app/views/admin/domain_blocks/confirm_suspension.html.haml

config/locales/en.yml

spec/controllers/admin/domain_blocks_controller_spec.rb

spec/features/admin/domain_blocks_spec.rb

...b/admin/metrics/measure/instance_accounts_measure_spec.rb

.../admin/metrics/measure/instance_followers_measure_spec.rb

...ib/admin/metrics/measure/instance_follows_measure_spec.rb

...etrics/measure/instance_media_attachments_measure_spec.rb

...ib/admin/metrics/measure/instance_reports_measure_spec.rb

...b/admin/metrics/measure/instance_statuses_measure_spec.rb