Enable closed_as_duplicate_of in issues API
What does this MR do and why?
After enabling on GitLab.com (#364749 (comment 993460181)) and not seeing any perf issues, this removes the FF to add closed_as_duplicate_of
to the Issues API response permanently.
Monitoring can be done here: #364749 (closed). Performance seems stable since enabled.
Documentation has already been added in https://docs.gitlab.com/ee/api/issues.html.
Screenshots or screen recordings
These are strongly recommended to assist reviewers and reduce the time to merge your change.
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 #364749 (closed)
Edited by Sean Arnold