Introduce a lightweight diffs_metadata endpoint
What does this MR do?
This introduces a lightweight diffs_metadata
endpoint which will be used mainly to populate the File Tree and the diffs panel.
Screenshots
Consistent low timings for serializing 114 diff file statistics
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry -
Documentation created/updated or follow-up review issue created -
Code review guidelines -
Merge request performance guidelines -
Style guides -
Database guides -
Separation of EE specific content
Performance and Testing
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