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Prevent virtual infinite loop in volume controller
**What this PR does / why we need it**:
In WatchPod(), if one of the two channels being watched (pod updates and events) is closed, the for/select loop turns into a tight infinite loop because the select immediately falls through due to the channel being closed.
This PR changes WatchPod() to Watch the two channels independently instead.
**Which issue(s) this PR fixes**:
Fixes#62571
**Release note**:
```release-note
Fix potential infinite loop that can occur when NFS PVs are recycled.
```
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