Remove unused code

What does this MR do?

As you can see from the comments on this issue https://gitlab.com/gitlab-org/gitlab-ce/issues/31202 the removed code is not being used.

Does this MR meet the acceptance criteria?

• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #31202 (closed)