Add prefill config for 21-4142

[gmrabian]

Enable form prefill for 21-4142

Summary

• Add form profile for 21-4142
• Add config for 21-4142 prefill and mapping
• Add tests

Related issue(s)

• https://app.zenhub.com/workspaces/vagov-product-team-forms-634853151f5c6000165942bc/issues/gh/department-of-veterans-affairs/va.gov-team-forms/190

Testing done

• Tested locally with frontend and backend. Prefilled all expected fields.

What areas of the site does it impact?

Form 21-4142 (not yet prod)

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 or Grafana (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

[ryan-mcneil]

LGTM