feat(full-stack): disable notifications after 3 failures

This stops notifications from firing over and over again if they are repeatedly failing.

[TESTING -> locally with docker compose, DATABASE MIGRATION -> there is a single migration]

Issue: https://www.pivotaltracker.com/story/show/b144646649n

- [ ] It works!
- [ ] Comments provide sufficient explanations for the next contributor
- [ ] Tests cover changes and corner cases
- [ ] Follows Quay syntax patterns and format

endpoints/api/test/test_disallow_for_apps.py

@@ -45,6 +45,7 @@ FIELD_ARGS = {'trigger_uuid': '1234', 'field_name': 'foobar'}
   (RepositoryNotificationList, 'post', None),
   (RepositoryNotification, 'get', NOTIFICATION_ARGS),
   (RepositoryNotification, 'delete', NOTIFICATION_ARGS),
+  (RepositoryNotification, 'post', NOTIFICATION_ARGS),
   (TestRepositoryNotification, 'post', NOTIFICATION_ARGS),
   (RepositoryImageSecurity, 'get', IMAGE_ARGS),
   (RepositoryManifestSecurity, 'get', MANIFEST_ARGS),