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

data/database.py

@@ -1006,6 +1006,7 @@ class RepositoryNotification(BaseModel):
   title = CharField(null=True)
   config_json = TextField()
   event_config_json = TextField(default='{}')
+  number_of_failures = IntegerField(default=0)
 
 
 class RepositoryAuthorizedEmail(BaseModel):