fix(gke): delete unused region tags and start migrating service region tag (#13112)

Author: OremGLG

kubernetes_engine/django_tutorial/polls.yaml

@@ -48,7 +48,6 @@ spec:
         # off in production.
         imagePullPolicy: Always
         env:
-            # [START gke_cloudsql_secrets_python]
             - name: DATABASE_NAME
               valueFrom:
                 secretKeyRef:
@@ -64,11 +63,9 @@ spec:
                 secretKeyRef:
                   name: cloudsql
                   key: password
-            # [END gke_cloudsql_secrets_python]
         ports:
         - containerPort: 8080
 
-      # [START gke_proxy_container_python]
       - image: gcr.io/cloudsql-docker/gce-proxy:1.16
         name: cloudsql-proxy
         command: ["/cloud_sql_proxy", "--dir=/cloudsql",
@@ -82,8 +79,6 @@ spec:
             mountPath: /etc/ssl/certs
           - name: cloudsql
             mountPath: /cloudsql
-      # [END gke_proxy_container_python]
-      # [START gke_volumes_python]
       volumes:
         - name: cloudsql-oauth-credentials
           secret:
@@ -93,10 +88,10 @@ spec:
             path: /etc/ssl/certs
         - name: cloudsql
           emptyDir: {}
-      # [END gke_volumes_python]
 # [END gke_kubernetes_deployment_yaml_python]
 ---
 
+# [START gke_kubernetes_service_yaml_python]
 # [START gke_container_poll_service_python]
 # The polls service provides a load-balancing proxy over the polls app
 # pods. By specifying the type as a 'LoadBalancer', Kubernetes Engine will
@@ -118,4 +113,5 @@ spec:
     targetPort: 8080
   selector:
     app: polls
-# [END gke_container_poll_service_python]
+# [END gke_container_poll_service_python]
+# [END gke_kubernetes_service_yaml_python]