Resolve "Remove geo-specific git version check"

What does this MR do?

Removes duplicate EE-only code following the merge of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16683

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

Why was this MR needed?

CE and EE now have the same minimum git version as Geo, so we don't need to perform a geo-specific check for git version

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Tests added for this feature/bug
• Review
  • Has been reviewed by Backend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• If paid feature, have we considered GitLab.com plan and how it works for groups and is there a design for promoting it to users who aren't on the correct plan
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

Closes #4762 (closed)