ci: disable helloworld on JDK 19 until compiler support is merged

Author: zapster

substratevm/ci.jsonnet

@@ -79,7 +79,8 @@
         # cannot yet use mx gate --tag build due to compile errors in /compiler
         ["mx", "build"],
         # cannot yet use mx gate --tag hello world due to missing JFR support in JDK 19
-        ["mx", "helloworld"],
+        # waiting for compiler support for JDK 19 (GR-39169)
+        # ["mx", "helloworld"],
       ]
     } + maven + svm_unittest + t("35:00"),
     windows_jdk17     + gate("basics", "build,helloworld,test,svmjunit") + svm_unittest + t("1:30:00"),