[cinder-csi-plugin] Make csi-snapshotter sidecar optional

[234u34k]

The csi-snapshotter sidecar is always deployed regardless of whether VolumeSnapshot CRDs are installed. On clusters without external-snapshotter, this produces continuous error logs.

Add csi.snapshotter.enabled (default true for backward compatibility) to gate the snapshotter container and its RBAC resources. Users without CRDs can set it to false.

Ref #2767

cinder-csi: Add csi.snapshotter.enabled toggle to allow disabling the csi-snapshotter sidecar when VolumeSnapshot CRDs are not installed.

[linux-foundation-easycla]

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