Refactor loan history schema

[data-doge]

Summary

Refactoring loan history schema. See department-of-veterans-affairs/vets-json-schema#748. After updating vets-json-schema to include the changes to the loan history form, we can remove a little bit of hard-coded code.

I'm on the Benefits decision reviews team, which is currently responsible for the COE form.

Related issue(s)

• COE | Fix hard coded parts of the form va.gov-team#53281

Testing done

Screenshots

Note: This field is mandatory for component work and UI changes (non-component work should NOT have screenshots).

	Before	After
Mobile
Desktop

What areas of the site does it impact?

COE form.

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
• Accessibility foundational testing has been performed

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?

[github-actions]

This PR is stale because it has been open 120 days with no activity. It will recieve a stale label every day for 14 days before being closed unless it recieves a comment or the stale label is removed.