adds a new check which moves bookmarks race check earlier, and this conflicts
with pushrebase. In reality pushrebase-enabled repos don't need this check
anyway, so we can just remove this generator.
- Group Reviewers
- rFBHGX473dc7b7661a: pushrebase: remove check-bookmarks parts generator
 adds a new check which moves bookmarks race check earlier, and this conflicts
- run pushrebase tests, see them change their status from failing to passing