UPSTREAM: <carry>: enable group snapshots by default

Enable the group snapshot feature gate by default in e2e tests. It is
enabled in OCP 4.19 by default.

Carry until it's enabled similarly upstream or until it reaches GA.

test/e2e/testing-manifests/storage-csi/hostpath/hostpath/csi-hostpath-plugin.yaml

@@ -358,6 +358,7 @@ spec:
           args:
             - -v=5
             - --csi-address=/csi/csi.sock
+            - --feature-gates=CSIVolumeGroupSnapshot=true
           securityContext:
             # This is necessary only for systems with SELinux, where
             # non-privileged sidecar containers cannot access unix domain socket