Preload the committers in branches list
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The following discussion from !168677 should be addressed:
- [ ] @annabeldunstone started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/168677#note_2153479497): (+6 comments)
> This seems to be causing a problem in `spec/features/tags/developer_views_tags_spec.rb:43` but I have no idea why :thinking:
issue