Re-enable autocomplete for milestones, tags, releases, and wiki

What does this MR do?

EE MR: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2170

• Re-enable autocomplete for milestones, tags, releases, and wiki

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

See https://gitlab.com/gitlab-org/gitlab-ce/issues/33598 for the full picture.

Why was this MR needed?

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11278 disabled the autocomplete for all the gl.GLForm instances across GitLab which isn't desired for many places.

https://gitlab.com/gitlab-org/gitlab-ce/issues/33598

Does this MR meet the acceptance criteria?

• Tests
  • Added for this feature/bug
  • 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 #33598 (closed)