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/views/admin_mailer/new_appeal.text.erb

@@ -0,0 +1,9 @@
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
+
+<%= raw t('admin_mailer.new_appeal.body', target: @appeal.account.username, action_taken_by: @appeal.strike.account.username, date: l(@appeal.strike.created_at), type: t(@appeal.strike.action, scope: 'admin_mailer.new_appeal.actions')) %>
+
+> <%= raw word_wrap(@appeal.text, break_sequence: "\n> ") %>
+
+<%= raw t('admin_mailer.new_appeal.next_steps') %>
+
+<%= raw t('application_mailer.view')%> <%= disputes_strike_url(@appeal.strike) %>