[FFS-4307, FFS-4308] support VA implementation support SSN and non SSN based lookup, as well as disability determinations

[iannorriswork]

Jira Ticket

• FFS-4307

Description

Turns out for VA eligibility determinations, two important notes:

1. when searching with or without an SSN, they are two entirely different endpoints (fun!)
2. the disability information we were grabbing was likely incorrect for the purposes of medicaid determinations---was less about the percentage, more about whether total disability applies (which can apply at 30% or at 100%).
3. fixed a bug introduced with the Rails rewrite to make sure its using real transaction ids again.

Submitter Checklist

• Jira Ticket: The relevant Jira ticket is linked in the header.
• Evidence of Testing: I have included evidence of bench testing (e.g., terminal output, screenshots, logs) below.
• Security Boundary: I have checked if any security boundaries are changing.
  • If yes, I have pointed to the relevant Security Impact Analysis (SIA) or escalated to the security team.
• Backwards Compatibility: I have verified that these changes do not introduce any backwards compatibility issues.
  • [] If no, I have added appropriate new versions or feature flags and flagged the team and appropriate stakeholders
• I've updated the Confluence documentation, content in the /docs folder, and any API spec docs

Reviewer Checklist

• Verification: I have verified that the changes work as intended.
• Backwards Compatibility: I have confirmed that the code does not introduce any backwards compatibility issues.
• Security & Privacy: I have reviewed the changes for potential security or privacy risks (e.g., PII handling).
• Contract Compliance: If the public API contract changed, I have verified that it is reflected in api-spec/ and follows the organization's standards.
• Code Quality: The code is clean, well-tested, and follows the established patterns in the codebase.
• Code Quality: The code has unit and integration tests that cover relevant code changes.

Evidence of Testing

 curl -k --location 'localhost:3000/api/v0/veteran-disability-ratings' \                                                               
        --header 'Content-Type: application/json' \
        --data '{
                    "ssn": "796-12-7781",
                  "firstName": "Andrea",
                  "lastName": "Mitchell",
                  "dateOfBirth": "1959-12-01"
                }'
{"totalDisabilityStatus":true,"totalDisabilityStatusEffectiveDate":"1983-05-01","dataSource":"VA","metadata":{"apiVersion":"1.3.0","environment":"development","requestTimestamp":"2026-05-13T21:43:31.611Z","responseTimestamp":"2026-05-13T21:43:33.072Z","datasourceDurationMillis":1460,"transactionId":"c1622227-4775-4282-9a65-07dd9fdd4205"},"rawData":{"data":{"permanent_and_total":{"service_connected_status":true,"pension_award_status":false},"total_disability":{"status":true,"effective_date":"1983-05-01"}}}}%