Draft: fix: expose validation error messages for branch rules

Duo Developerrequested to merge
workloads/4ce3a013e64 into master

Relates to issue #517472 (closed)

This MR was created by Duo in Session 1202665

Changes

  • Expose specific backend validation error messages instead of generic error message when editing branch rules
  • Replace generic "Something went wrong while updating branch rule" with actual validation errors from the backend
  • Improve user experience by showing clear error messages for squash option validation failures

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