96358 Add well-defined attachment ID order for backend - form 10-10d

[michaelclement]

Are you removing, renaming or moving a folder in this PR?

• [X] No, I'm not changing any folders (skip to TeamSites and delete the rest of this section)
• [ ] Yes, I'm removing, renaming or moving a folder

Did you change site-wide styles, platform utilities or other infrastructure?

• [X] No
• [ ] Yes, and I used the proxy-rewrite steps to test the injected header scenario

Summary

This PR imposes an order on the attachmentIds provided to the back end, which fixes the misalignment we're seeing on the BE where files are miscategorized due to a attachment-to-list mapping

Related issue(s)

• https://github.com/department-of-veterans-affairs/va.gov-team/issues/96358

Testing done

• Manual
• Unit

Screenshots

NA

What areas of the site does it impact?

This form only

Acceptance criteria

Quality Assurance & Testing

• [ ] I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• [ ] No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• [ ] Linting warnings have been addressed
• [ ] Documentation has been updated (link to documentation *if necessary)
• [ ] Screenshot of the developed feature is added
• [ ] Accessibility testing has been performed

Error Handling

• [ ] Browser console contains no warnings or errors.
• [ ] Events are being sent to the appropriate logging solution
• [ ] Feature/bug has a monitor built into Datadog or Grafana (if applicable)

Authentication

• [ ] Did you login to a local build and verify all authenticated routes work as expected with a test user

Requested Feedback

NA