Add appeals (#17364)

* Add appeals

* Add ability to reject appeals and ability to browse pending appeals in admin UI

* Add strikes to account page in settings

* Various fixes and improvements

- Add separate notification setting for appeals, separate from reports
- Fix style of links in report/strike header
- Change approving an appeal to not restore statuses (due to federation complexities)
- Change style of successfully appealed strikes on account settings page
- Change account settings page to only show unappealed or recently appealed strikes

* Change appealed_at to overruled_at

* Fix missing method error

spec/mailers/previews/admin_mailer_preview.rb

@@ -15,4 +15,9 @@ class AdminMailerPreview < ActionMailer::Preview
   def new_trending_links
     AdminMailer.new_trending_links(Account.first, PreviewCard.limit(3))
   end
+
+  # Preview this email at http://localhost:3000/rails/mailers/admin_mailer/new_appeal
+  def new_appeal
+    AdminMailer.new_appeal(Account.first, Appeal.first)
+  end
 end