Adopting an orphan maintenance job after Velero server restarted

[qiuming-best]

Describe the problem/challenge you have

If we restarted the Velero server when there still having running maintenance job, the maintenance job would be orphan without tracking by the Velero server. the result of the maintenance job would not be recorded on backuprepositories CR.

Maybe we need to establish a relation between backuprepositories CR and maintenance job.