Wait all PVBs of ItemBlock to be completed before executing the ItemBlock hooks

[ywk253100]

This is a follow-up action for PR #8490.

In #8490, the pod post-backup hook handler waits all PVBs of the backup to be completed before executing the pod hooks, this delays the execution time of hook. The ideal behavior is to execute the hooks once the PVBs of ItemBlock are completed.

Because the fix involves some effort, create this new issue to track.

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[ywk253100]

Close as the PR #8490 closed