Add resizer to release staging deployments

Author: davidz627

deploy/kubernetes/overlays/prow-gke-release-staging-head/kustomization.yaml

@@ -15,3 +15,6 @@ images:
 - name: gke.gcr.io/csi-node-driver-registrar
   newName: gcr.io/gke-release-staging/csi-node-driver-registrar
   newTag: "latest"
+- name: gke.gcr.io/csi-resizer
+  newName: gke.gcr.io/csi-resizer
+  newTag: "v0.3.0-gke.0"

deploy/kubernetes/overlays/prow-gke-release-staging-rc/kustomization.yaml

@@ -15,3 +15,6 @@ images:
 - name: gke.gcr.io/csi-node-driver-registrar
   newName: gcr.io/gke-release-staging/csi-node-driver-registrar
   newTag: "v1.2.0-gke.0"
+- name: gke.gcr.io/csi-resizer
+  newName: gke.gcr.io/csi-resizer
+  newTag: "v0.3.0-gke.0"