[10-10EZ] Add VANotify Callbacks to Failure email

[coope93]

Summary

• This work is behind a feature toggle (flipper): YES
• Added VANotify callbacks to the 10-10EZ Submission Failure email. The callbacks increment relevant statsD metrics and logs for success/failure, and we will be adding monitors in datadog for these metrics.
• 10-10 Health Apps
• Behind new hca_zero_silent_failures toggle

Related issue(s)

• [BE] 10-10EZ - Zero silent failures: Set up VA Notify Callback integration for Submission Failure email va.gov-team#93247

Testing done

• New code is covered by unit tests
• We will validate that the relevant vanotify statsD metrics are incremented with our email tags in staging

What areas of the site does it impact?

10-10EZ

Acceptance criteria

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No error nor warning in the console.
• Events are being sent to the appropriate logging solution
• Documentation has been updated (link to documentation)
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• Feature/bug has a monitor built into Datadog (if applicable)
• If app impacted requires authentication, did you login to a local build and verify all authenticated routes work as expected
• I added a screenshot of the developed feature

[coope93]

Replaced these with a variable to DRY it up a bit. It's a little different than others since the prefix comes from the service and not the class under test, but I still like it better than hardcoding it.

[coope93]

Have to add this since toggles are on be default in test environments.

[JoshingYou1]

LGTM! Nice work Brandon! 😃