BUG: v3 delivery status callback

[kalbfled]

Description

• Ticket is understood, and QA has been contacted (if the ticket has a QA label).

After Notify makes an HTTP request to a provider and receives a 200 response, the provider should make HTTP requests to the delivery status callback endpoints to update the notification status in the Notify database. The status is not being updated.

Steps to Reproduce

1. Send a notification to your self with a v3 endpoint.
2. Wait until you receive the notification.
3. GET the notification, and note that it remains in "sent" status.

Impact/Urgency

Expected Behavior

• Notifications progress from "created," to "sent," . . . , to "delivered."

QA Considerations

• refactor regression tests to account for this update

Additional Info & Resources

The status is being set to "sent" when sending the notification in app/celery/v3/notification_tasks.py

• see v3 code here
• Notifications should be sent to "sending" when sending to the provider

[cris-oddball]

NOTE: in testing #1770 we discovered that this bug prevents the email statuses being sent back to VAProfile.