Backport of CSI: include volume namespace in staging path into release/1.7.x #20573
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Backport
This PR is auto-generated from #20532 to be assessed for backporting due to the inclusion of the label backport/1.7.x.
The below text is copied from the body of the original PR.
CSI volumes are namespaced. But the client does not include the namespace in the staging mount path. This causes CSI volumes with the same volume ID but different namespace to collide if they happen to be placed on the same host. The per-allocation paths don't need to be namespaced, because an allocation can only mount volumes from its job's own namespace.
Fixes: #18741
See #18741 (comment) for my notes on upgrade testing.
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