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/notificationmethod.py

@@ -51,6 +51,7 @@ class NotificationMethod(object):
     """
     raise NotImplementedError
 
+
   def perform(self, notification_obj, event_handler, notification_data):
     """
     Performs the notification method.
@@ -114,7 +115,6 @@ class QuayNotificationMethod(NotificationMethod):
       # Lookup the team's members
       return (True, None, model.organization.get_organization_team_members(org_team.id))
 
-
   def perform(self, notification_obj, event_handler, notification_data):
     repository = notification_obj.repository
     if not repository: