disable vllm EKS test on mainline pipeline (#5129)

Author: junpuf

test/testrunner.py

@@ -322,10 +322,9 @@ def main():
         elif all("vllm" in image_uri for image_uri in all_image_list) and test_type not in {
             "functionality_sanity",
             "security_sanity",
-            "eks",
         }:
             LOGGER.info(
-                f"NOTE: {specific_test_type} tests not supported on vllm images. Skipping..."
+                f"NOTE: {specific_test_type} tests not supported on vllm images in MAINLINE. Skipping..."
             )
             return