Add EKS test for vLLM (#5016)

add vllm related eks cluster creation script and tests

Author: jinyan-li1

eks_infrastructure/build_param.json

@@ -4,8 +4,9 @@
         "MAINLINE"
     ],
     "eks_clusters": [
-        "dlc-pytorch",
-        "dlc-tensorflow"
+         "dlc-pytorch",
+        "dlc-tensorflow",
+        "dlc-vllm"
     ],
     "eks_version": "1.32",
     "cluster_autoscalar_image_version": "v1.32.0"