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

spec/controllers/disputes/appeals_controller_spec.rb

@@ -0,0 +1,27 @@
+require 'rails_helper'
+
+RSpec.describe Disputes::AppealsController, type: :controller do
+  render_views
+
+  before { sign_in current_user, scope: :user }
+
+  let!(:admin) { Fabricate(:user, admin: true) }
+
+  describe '#create' do
+    let(:current_user) { Fabricate(:user) }
+    let(:strike) { Fabricate(:account_warning, target_account: current_user.account) }
+
+    before do
+      allow(AdminMailer).to receive(:new_appeal).and_return(double('email', deliver_later: nil))
+      post :create, params: { strike_id: strike.id, appeal: { text: 'Foo' } }
+    end
+
+    it 'notifies staff about new appeal' do
+      expect(AdminMailer).to have_received(:new_appeal).with(admin.account, Appeal.last)
+    end
+
+    it 'redirects back to the strike page' do
+      expect(response).to redirect_to(disputes_strike_path(strike.id))
+    end
+  end
+end