Remove pension_military_prefill flipper

[TaiWilkin]

Summary

• Removes the flipper pension_military_history

Related issue(s)

https://github.com/orgs/department-of-veterans-affairs/projects/1278/views/4?pane=issue&itemId=71138421&issue=department-of-veterans-affairs%7Cva.gov-team%7C88486

Testing done

• New code is covered by unit tests
• Login as vets.gov.user+233@gmail.com on the review deployment (set oauth=false and use ID.me) and start a new Pensions form. The Applicant Information page should be filled out as usual. The email address and phone number fields should be filled in. The service branch should be Army, and the start and end dates should be filled in. The service number should be the veteran's SSN (prefilled on Applicant Information).

What areas of the site does it impact?

Pensions

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

[mjknight50]

GTG

[rmtolmach]

Once this is deployed, you'll need to follow step 3 of this section of this guide to completely remove this toggle. You'll need to do it in the terminal of each ArgoCD environment. If you or no one on your team has access to those terminals, let me know and I can do it for you. Remember, don't delete them in Argo until the code has been deployed.

[github-actions]

Backend-review-group approval confirmed.

[TaiWilkin]

The flipper has been removed from each environment.