Brecht Van Lommel 0268ee5c37
Do not create commit graph for temporary repos (#23219)
When fetching remotes for conflict checking, skip unnecessary and
potentially slow writing of commit graphs.

In a test with the Blender repository, this reduces conflict checking
time for one pull request from about 2s to 0.1s.
2023-03-01 14:19:04 -05:00
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