Created feature flag for CHAMPVA unique temp file names

[stevelong00]

Summary

• This work is behind a feature toggle (flipper): NO
• Created a new feature flag for CHAMPVA unique temp file names
• Not a bug
• This feature flag is needed for some upcoming work
• I work for IVC Forms / CHAMPVA
• The success criteria with the new flipper is to be able to create temp files with unique file names that avoids collisions and fixes a bug in production

Related issue(s)

• The related ticket
• This ticket is not inside an epic

Testing done

• New code is covered by unit tests
• NA Describe what the old behavior was prior to the change
• NA Describe the steps required to verify your changes are working as expected. Exclusively stating 'Specs run' is NOT acceptable as appropriate testing

Screenshots

None

What areas of the site does it impact?

This only creates a new flipper, nothing else

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 (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

Requested Feedback

None

[github-actions]

Backend-review-group approval confirmed.