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Prevent N+1 when diffStats is queried via GraphQL

Patrick Bajao requested to merge 416505-fix-n-plus-1-merge-requests-diff-stats into master

What does this MR do and why?

Preload the latest_merge_request_diff when diffStats field is queried by using lookahead.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #416505 (closed)

Merge request reports