Merge branch 'ph/434444/targetBranchRulesCaseFix' into 'master'

Fixes target branch rules downcasing the branch name incorrectly

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/139264



Merged-by: Gary Holtz <gholtz@gitlab.com>
Approved-by: Tarun Vellishetty <tvellishetty@gitlab.com>
Approved-by: Gary Holtz <gholtz@gitlab.com>
Co-authored-by: Phil Hughes <me@iamphill.com>