Resolve "GroupsController#activity.json is REALLY slow due to SQL"
EE version: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1226
What does this MR do?
This solves a classic N + 1 queries problem.
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Does this MR meet the acceptance criteria?
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Changelog entry added - Tests
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All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together
Closes #27395 (closed)