[EE Compat] Only check LFS integrity for first branch in push
What
See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17098
Does this MR meet the acceptance criteria?
-
Changelog entry added, if necessary -
Tests added for this feature/bug - Review
-
Has been reviewed by Backend
-
-
End-to-end tests pass ( package-qamanual pipeline job)