Update Return Status

Update return status.

Certain status transitions trigger additional side effects to maintain data consistency:

• Setting status to complete will also mark all return items as complete.
• Setting status to open from complete or rejected will reopen the return, resetting all processed/rejected items back to open, clearing pending processing info, resetting the expiration date, and marking the return as reopened. Note: Reopening a processed return does not reverse any refunds, exchanges, or other actions that were performed during processing.

Requires the returns_write scope.