Add metrics for br federation manager

[WangLe1321]

Feature Request

Is your feature request related to a problem? Please describe:

Describe the feature you'd like:

Metrics:

• VolumeBackup (#total, #success, #failed, total_time, backup_size).
• Cleanup (#total, #success, #failed, total_time)

Tags: namespace. Tc name, k8_cluster, fed_manager_pod_name

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy: