Merge branch 'fix-merge-request-pipeline-creation-branch-check' into 'master'

Fix incorrect branch access check

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/180225



Merged-by: Allison Browne <abrowne@gitlab.com>
Approved-by: Daniel P. <dprause@gitlab.com>
Approved-by: Allison Browne <abrowne@gitlab.com>
Reviewed-by: Hordur Freyr Yngvason <hfyngvason@gitlab.com>
Reviewed-by: Allison Browne <abrowne@gitlab.com>
Co-authored-by: Daniel Prause <dprause@gitlab.com>
Co-authored-by: Hordur Freyr Yngvason <hfyngvason@gitlab.com>