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/strikes_controller_spec.rb

@@ -0,0 +1,30 @@
+require 'rails_helper'
+
+RSpec.describe Disputes::StrikesController, type: :controller do
+  render_views
+
+  before { sign_in current_user, scope: :user }
+
+  describe '#show' do
+    let(:current_user) { Fabricate(:user) }
+    let(:strike) { Fabricate(:account_warning, target_account: current_user.account) }
+
+    before do
+      get :show, params: { id: strike.id }
+    end
+
+    context 'when meant for the user' do
+      it 'returns http success' do
+        expect(response).to have_http_status(:success)
+      end
+    end
+
+    context 'when meant for a different user' do
+      let(:strike) { Fabricate(:account_warning) }
+
+      it 'returns http forbidden' do
+        expect(response).to have_http_status(:forbidden)
+      end
+    end
+  end
+end