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/disputes/appeals/index.html.haml

@@ -0,0 +1,22 @@
+- content_for :page_title do
+  = t('admin.disputes.appeals.title')
+
+- content_for :header_tags do
+  = javascript_pack_tag 'admin', async: true, crossorigin: 'anonymous'
+
+.filters
+  .filter-subset
+    %strong= t('admin.tags.review')
+    %ul
+      %li= filter_link_to safe_join([t('admin.accounts.moderation.pending'), "(#{Appeal.pending.count})"], ' '), status: 'pending'
+      %li= filter_link_to t('admin.trends.approved'), status: 'approved'
+      %li= filter_link_to t('admin.trends.rejected'), status: 'rejected'
+
+- if @appeals.empty?
+  %div.muted-hint.center-text
+    = t 'admin.disputes.appeals.empty'
+- else
+  .announcements-list
+    = render partial: 'appeal', collection: @appeals
+
+= paginate @appeals