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Setting REMOUNT_VOLUME_PLUGIN_DIR for COS images in kube-env

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #60725

**Special notes for your reviewer**: Not sure if it's the best place to set `REMOUNT_VOLUME_PLUGIN_DIR`.

/sig storage
/sig cluster-lifecycle