Fix NodeGroup for for deployment files

Author: mackjmr

src/orderproducerservice/deployment-staging.yaml

@@ -49,7 +49,7 @@ spec:
                   - key: alpha.eksctl.io/nodegroup-name
                     operator: In
                     values:
-                      - ng-4
+                      - PLACEHOLDER_NODE_GROUP
       initContainers:
         - command:
           - sh

src/zookeeperservice/deployment-staging.yaml

@@ -45,7 +45,7 @@ spec:
                   - key: alpha.eksctl.io/nodegroup-name
                     operator: In
                     values:
-                      - ng-4
+                      - PLACEHOLDER_NODE_GROUP
       containers:
         - name: zookeeper
           image: confluentinc/cp-zookeeper:7.2.2