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

app/models/user.rb

@@ -265,6 +265,10 @@ class User < ApplicationRecord
     settings.notification_emails['pending_account']
   end
 
+  def allows_appeal_emails?
+    settings.notification_emails['appeal']
+  end
+
   def allows_trending_tag_emails?
     settings.notification_emails['trending_tag']
   end