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/controllers/disputes/base_controller.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class Disputes::BaseController < ApplicationController
+  include Authorization
+
+  layout 'admin'
+
+  skip_before_action :require_functional!
+
+  before_action :set_body_classes
+  before_action :authenticate_user!
+
+  private
+
+  def set_body_classes
+    @body_classes = 'admin'
+  end
+end