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

config/settings.yml

@@ -48,6 +48,7 @@ defaults: &defaults
     report: true
     pending_account: true
     trending_tag: true
+    appeal: true
   interactions:
     must_be_follower: false
     must_be_following: false