Deprecate single merge changes endpoint
What does this MR do and why?
Describe in detail what your merge request does and why.
This provides a deprecation notice for the Single changes API endpoint which is deprecated per the note: https://docs.gitlab.com/ee/api/merge_requests.html#get-single-merge-request-changes
Screenshots or screen recordings
Screenshots are required for UI changes, and strongly recommended for all other merge requests.
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #388311 (closed)
Edited by Amy Qualls