Revert "remove wait time as we don't depend on VAS (awslabs#462)"

This reverts commit b9ed3be.

Author: mengqiy

tests/tasks/setup/eks/awscli-mng.yaml

@@ -48,6 +48,12 @@ spec:
     image: alpine/k8s:1.23.7
     script: |
       ENDPOINT_FLAG=""
+      # Todo: remove this workaround for nodes less than 5k when our scaling system can scale up instantly
+      if [ $(params.desired-nodes) -lt 5001  ] && [ $(params.desired-nodes) -gt 500 ]
+      then
+        echo "sleeping for 15 mins to workaround VAS cool off time"
+        sleep 900
+      fi
 
       NODE_ROLE_NAME=$(params.host-cluster-node-role-name)
       NODE_ROLE_ARN=$(aws iam get-role --role-name $NODE_ROLE_NAME --query 'Role.[Arn]' --output text)