refactor: remove cloud snippets from k8s esp_echo_http.yaml configuration (#10284)

Author: Kef131

endpoints/getting-started/k8s/esp_echo_http.yaml

@@ -38,13 +38,10 @@ spec:
       labels:
         app: esp-echo
     spec:
-      # [START endpoints_secret1_yaml_java]
       volumes:
         - name: service-account-creds
           secret:
             secretName: service-account-creds
-      # [END endpoints_secret1_yaml_java]
-      # [START endpoints_service_yaml_java]
       containers:
         - name: esp
           image: gcr.io/endpoints-release/endpoints-runtime:1
@@ -55,15 +52,12 @@ spec:
             "--rollout_strategy", "managed",
             "--service_account_key", "/etc/nginx/creds/service-account-creds.json",
           ]
-      # [END endpoints_service_yaml_java]
           ports:
             - containerPort: 8080
-          # [START endpoints_secret2_yaml_java]
           volumeMounts:
             - mountPath: /etc/nginx/creds
               name: service-account-creds
               readOnly: true
-          # [END endpoints_secret2_yaml_java]
         - name: echo
           image: gcr.io/endpoints-release/echo:latest
           ports: