Api 24421 remove participant claimant

[mchristiansonVA]

Summary

• Optional claimaintParticipantId has been removed as a parameter for the ITF submit endpoint.
• Note this is branched off of API-24399_Update_HTTP_error_response, and should be merged after API-24399 changes have been merged.

Related issue(s)

API-24421

Testing done

• ITF submit endpoint formerly accepted a claimantParticipantId parameter; manually tested with Postman to ensure the endpoint still handles submissions for all ITF types without parameter and ignores if supplied.
• Confirmed validation for claimantParticipantId parameter was removed.
• Tested ITF "survivor" submission parameter handling for claimantSsn and claimantParticipantId; confirmed backend requests to BGS were correctly adding claimant_participant_id to the request.
• Confirmed HTTP 422 returned for ITF type "survivor" w/ no claimantSsn param supplied, or when claimantSsn param is the same value as veteran SSN.

What areas of the site does it impact?

• Claims API ITF submit endpoint.

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

[FonzMP]