Improve performance of GitHub importer
What does this MR do?
- Fetch all refs in a single run
- Skip merge request metrics
Are there points in the code the reviewer needs to double check?
This is based upon !9992 (merged) and depends on https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/125. After the first gets merged I will rebase this one.
Why was this MR needed?
The GitHub import process is extremely slow for large repositories.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
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