add variable condition snapshot in vSphere CSI (#9429)

roles/kubernetes-apps/csi_driver/vsphere/defaults/main.yml

@@ -31,3 +31,7 @@ vsphere_csi_node_affinity: {}
 # may contain some private data, so it is recommended to set it to false
 # in the production environment.
 unsafe_show_logs: false
+
+# https://github.com/kubernetes-sigs/vsphere-csi-driver/blob/master/docs/book/features/volume_snapshot.md#how-to-enable-volume-snapshot--restore-feature-in-vsphere-csi-
+# according to the above link , we can controler the block-volume-snapshot parameter
+vsphere_csi_block_volume_snapshot: false

roles/kubernetes-apps/csi_driver/vsphere/templates/vsphere-csi-controller-config.yml.j2

@@ -11,7 +11,7 @@ data:
   "async-query-volume": "true"
   "improved-csi-idempotency": "true"
   "improved-volume-topology": "true"
-  "block-volume-snapshot": "false"
+  "block-volume-snapshot": "{{ vsphere_csi_block_volume_snapshot }}"
   "csi-windows-support": "false"
 {% if vsphere_csi_controller is version('v2.5.0', '>=') %}
   "use-csinode-id": "true"