Backupmeta is incorrect if there are redundant PVCs or PVs of TiKV

[WangLe1321]

Bug Report

What version of TiDB Operator are you using?

v1.5

What did you do?

Start a volume backup, then use it to restore new cluster.

In the backup tidb cluster, there are 3 redundant pvs. It means that the 3 redundant pvs has labels indicating that they are the pvs of the backup cluster. But there is no pvc of the backup cluster pointing them.

What did you expect to see?

restore successfully

What did you see instead?

restore blocked and found error message in log.

E1212 12:52:29.587228 1 restore_controller.go:111] Restore: tidb-mussel-prod-dr-1/fed-test-1, sync failed, err: .kubernetes.pvcs and pvs for CloudSnapBackup not matched, requeuing