Fix MR Settings template page

What does this MR do and why?

Failed pipeline: https://jihulab.com/gitlab-cn/gitlab/-/pipelines/1502051

Failed job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/9202957

Changes from Upstream: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/130172/diffs

Upstream moved merge request setting templates into same directory, JH need to follow the refactor and rename the path.

Screenshots or screen recordings

How to set up and validate locally

• Turn on FF single_squash_merge_ff
• Go to project MR settings page

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.