Move Windows deployment to stable overlay

move Windows pd csi deployent to stable overlay

Author: jingxu97

deploy/kubernetes/images/stable/image.yaml

@@ -51,5 +51,5 @@ imageTag:
   name: gke.gcr.io/gcp-compute-persistent-disk-csi-driver
   # Don't change stable image without changing pdImagePlaceholder in
   # test/k8s-integration/main.go
-  newTag: "v1.2.0-gke.0"
+  newTag: "v1.2.0-gke.8"
 ---

test/run-windows-k8s-integration.sh

@@ -10,7 +10,7 @@ set -o nounset
 set -o errexit
 
 readonly PKGDIR=${GOPATH}/src/sigs.k8s.io/gcp-compute-persistent-disk-csi-driver
-readonly overlay_name="${GCE_PD_OVERLAY_NAME:-alpha}"
+readonly overlay_name="${GCE_PD_OVERLAY_NAME:-stable}"
 readonly do_driver_build="${GCE_PD_DO_DRIVER_BUILD:-true}"
 readonly deployment_strategy=${DEPLOYMENT_STRATEGY:-gce}
 readonly test_version=${TEST_VERSION:-master}