Implement mergeRequestSetReviewers mutation
What does this MR do and why?
Adds mergeRequestSetReviewers
GraphQL mutation that will be used by the frontend to set reviewers.
This has the same pattern of arguments and fields as the one for assignees.
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 #367947 (closed)