Use environment variable JDK_19 instead of JDK_9

JDK_19 is set on TeamCity agents, not JDK_9.

Also do not invoke getJreHome() because Java 9 distribution does not
have a "jre" subdirectory

compiler/tests-common/org/jetbrains/kotlin/test/KotlinTestUtils.java

@@ -497,12 +497,12 @@ public class KotlinTestUtils {
             JvmContentRootsKt.addJvmClasspathRoots(configuration, PathUtil.getJdkClassesRootsFromJre(getJreHome(jdk6)));
         }
         else if (jdkKind == TestJdkKind.FULL_JDK_9) {
-            String jdk9 = System.getenv("JDK_9");
+            String jdk9 = System.getenv("JDK_19");
             if (jdk9 != null) {
-                configuration.put(JVMConfigurationKeys.JDK_HOME, new File(getJreHome(jdk9)));
+                configuration.put(JVMConfigurationKeys.JDK_HOME, new File(jdk9));
             }
             else {
-                System.err.println("Environment variable JDK_9 is not set, the test will be skipped");
+                System.err.println("Environment variable JDK_19 is not set, the test will be skipped");
             }
         }
         else {

compiler/tests-common/org/jetbrains/kotlin/test/TestJdkKind.java

@@ -23,7 +23,7 @@ public enum TestJdkKind {
     MODIFIED_MOCK_JDK,
     // JDK found at $JDK_16
     FULL_JDK_6,
-    // JDK found at $JDK_9
+    // JDK found at $JDK_19
     FULL_JDK_9,
     // JDK found at java.home
     FULL_JDK,