Don't synchronize default branch when updating a SSH mirror
What does this MR do?
Disable the default branch update if SSH project mirrors are being used for now, since it is affecting GitLab.com users. A proper fix should land in %11.5.
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
EE specific content should be in the top level /eefolder -
For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?