What does this MR do?
Reduce method calls and general data being sent on when requesting Projects::MergeRequestsController#show.json.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Review
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Has been reviewed by Backend
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together
What are the relevant issue numbers?
Part of #36876