Closes #228

👩🏻‍💻 What does this PR do?

If a notification has a valid configuration, but the status is set to disabled, show this popup when they hit save:

🧪 How has/should this change been tested?

• Create a new notification
• Fill out required fields, keep the Enabled toggle off
• Hit save, this modal should appear
• Select Cancel
• Enable the notification, hit save again - see that saving works right away
• Disable the notification again, and hit save again
• You should get the modal again, this time select Ok
• Your disabled config is saved

💌 Any notes for the reviewer?

• I think the wording could be clearer? Of what happens on cancel and ok?
• Wanted a popup with Enable & Save and Save anyway or something like that, but was limited by the confirmation modal to Cancel and Ok (if we think the former options are really worth it we could create a new modal, but would take longer...
• Feels a bit clunky that when you hit ok, the notification is saved, but you stay on the same page. For some reason, now that there is a modal, I'm expecting to be redirected back to the list of notification. Does it feel the same to you? Could redirect after... or maybe a success snack popup would help?