[Features] Backup support stop and start

[fengluodb]

Currently, backup jobs fail when the cluster is stopped. The expected behavior is that running backup jobs should:

1. Gracefully stop when the cluster is stopped
2. Automatically resume when the cluster restarts

This will improve the resilience of the backup system and prevent job failures during cluster maintenance.

[nayutah]

also consider the cases for failed backup repos (s3, minio etc.), it is nice for the backup jobs to fail fast and give warnings.

[github-actions[bot]]

This issue has been marked as stale because it has been open for 30 days with no activity