Allow auth via JWT (always false in CE)

What does this MR do?

Allow auth via JWT (always false in CE) which allows other MR's to function.

Are there points in the code the reviewer needs to double check?

• [ ] Need Changelog entry?
• [ ] Need documentation change?

❗ Works with https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/6455 - Geo: backend support to allow Secondary node to push to a Primary as push proxying

Why was this MR needed?

To facilitate the proxying of SSH git push requests sent to the primary, from the secondary https://gitlab.com/gitlab-org/gitlab-ee/issues/6533

Screenshots (if relevant)

N/A

Does this MR meet the acceptance criteria?

• [ ] Changelog entry added, if necessary
• [ ] Documentation created/updated
• [ ] API support added
• [ ] Tests added for this feature/bug
• Conforms to the code review guidelines
  • [ ] Has been reviewed by a UX Designer
  • [ ] Has been reviewed by a Frontend maintainer
  • Has been reviewed by a Backend maintainer
  • [ ] Has been reviewed by a Database specialist
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• [ ] Conforms to the database guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• [ ] Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/6533