Trigger mergeRequestReviewersUpdated subscription when reviewers change
What does this MR do and why?
When reviewers change, we need to let the subscribers of mergeRequestReviewersUpdated
GraphQL subscription about the changes. We trigger the subscription when that happens.
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 #366857 (closed)