VMIM is unavailable for debugging as the resource is deleted upon migration failure

CNV 4.20.5， CNV 4.21.0

Always

1. Create a VM 
2. Create a Plan migrate the VM to another cluster
3. Make the migration failed (in my cluster, migrate OCS VM to HPP will cause the migration failed)
4. Check the Plan

In the Plan, we got "Migration failed, check VMIM status for details." but the VMIM is deleting once the migration failed. 

        Description:  Synchronize source and target VMs.
        Error:
          Phase:  Running
          Reasons:
            Migration failed, check VMIM status for details.
        Name:   Synchronization
        Phase:  Running
        Progress:
          Completed:    0
          Total:        1
      Started:          2026-01-14T08:21:58Z
  Observed Generation:  1
Events:
  Type    Reason     Age                From  Message
  ----    ------     ----               ----  -------
  Normal  Ready      71m                plan  The migration plan is ready.
  Normal  Executing  64m (x2 over 71m)  plan  The plan is EXECUTING.
  Normal  Failed     64m                plan  The plan execution has FAILED.

Should have a better way to handle the error message in Plan