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

static/directives/repository-events-table.html

@@ -29,6 +29,7 @@
                 <td>Title</td>
                 <td>Event</td>
                 <td>Notification</td>
+                <td>Enabled</td>
                 <td class="options-col"></td>
               </tr>
             </thead>
@@ -70,6 +71,11 @@
                   </span>
                 </td>
 
+                <td>
+                  <span ng-if="notification.number_of_failures >= 3">Disabled due to 3 failed attempts in a row</span>
+                  <span ng-if="notification.number_of_failures < 3">Enabled</span>
+                </td>
+
                 <td>
                   <span class="cor-options-menu">
                     <span class="cor-option" option-click="testNotification(notification)">
@@ -93,6 +99,9 @@
                     <span class="cor-option" option-click="deleteNotification(notification)">
                       <i class="fa fa-times"></i> Delete Notification
                     </span>
+                    <span ng-if="notification.number_of_failures >= 3" class="cor-option" option-click="reenableNotification(notification)">
+                      <i class="fa fa-adjust"></i> Re-enable Notification
+                    </span>
                   </span>
                 </td>
               </tr>