* Rename NotificationController to AnnouncementController
* Fix test
* Add test for missing NotificationController state
* Bump controllers
* Move test to correct file
* Rename config key
* Add migration 71 to list of migrations
* Fix selector after migration
This was done to reduce the number of direct dependencies we have. It
should be functionally equivalent. The bundle size should not change,
as we use `clone` as a transitive dependency in a number of places.