1421: add form-1095b service tag for datadog monitoring

[kpethtel]

Summary

• *This work is behind a feature toggle (flipper): NO (but these endpoints are not currently in use)
• Adds a service tag for use on datadog. AFAIK no additional steps are necessary to make this service appear on DD.

Related issue(s)

https://github.com/department-of-veterans-affairs/va-iir/issues/1424

Testing done

I don't think this needs to be tested, but I'm open to suggestion if anyone has ideas.

Screenshots

Note: Optional

What areas of the site does it impact?

It should create a new service on DD that can be used for monitoring this feature.

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

Requested Feedback

(OPTIONAL)What should the reviewers know in addition to the above. Is there anything specific you wish the reviewer to assist with. Do you have any concerns with this PR, why?

[khenson-oddball]

LGTM