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[Real time MR] Implements mergeRequestDiffGenerated GraphQL subscription

Patrick Bajao requested to merge 397739-trigger-merge-request-diff-generated-subscription into master

What does this MR do and why?

This introduces mergeRequestDiffGenerated GraphQL subscription that frontend can subscribe to in order to update MR changes count in real-time.

This gets triggered when a MergeRequestDiff record associated to merge request is created.

This is behind merge_request_diff_generated_subscription feature flag.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #397739 (closed) and #433188 (closed)

Edited by Patrick Bajao

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