Admin controllers specs (#23917)

spec/controllers/admin/account_actions_controller_spec.rb

spec/controllers/admin/announcements_controller_spec.rb

...ntrollers/admin/follow_recommendations_controller_spec.rb

spec/controllers/admin/ip_blocks_controller_spec.rb

spec/controllers/admin/relationships_controller_spec.rb

spec/controllers/admin/relays_controller_spec.rb

spec/controllers/admin/rules_controller_spec.rb

spec/controllers/admin/settings/about_controller_spec.rb

.../controllers/admin/settings/appearance_controller_spec.rb

...llers/admin/settings/content_retention_controller_spec.rb

spec/controllers/admin/settings/discovery_controller_spec.rb

...ntrollers/admin/settings/registrations_controller_spec.rb

spec/controllers/admin/site_uploads_controller_spec.rb

...in/trends/links/preview_card_providers_controller_spec.rb

spec/controllers/admin/trends/links_controller_spec.rb

spec/controllers/admin/trends/statuses_controller_spec.rb

spec/controllers/admin/trends/tags_controller_spec.rb

spec/controllers/admin/warning_presets_controller_spec.rb

spec/controllers/admin/webhooks/secrets_controller_spec.rb

spec/controllers/admin/webhooks_controller_spec.rb