Migrate all JDK 9 related tests to JDK 11

compiler/test-infrastructure-utils/tests/org/jetbrains/kotlin/test/TestJavacVersion.kt

@@ -6,5 +6,5 @@
 package org.jetbrains.kotlin.test
 
 enum class TestJavacVersion {
-    JAVAC_1_8, JAVAC_9
-}
+    JAVAC_1_8, JAVAC_11
+}

compiler/test-infrastructure-utils/tests/org/jetbrains/kotlin/test/TestJdkKind.kt

@@ -26,9 +26,6 @@ enum class TestJdkKind(val requiresSeparateProcess: Boolean = false) {
     // JDK found at $JDK_16
     FULL_JDK_6(requiresSeparateProcess = true),
 
-    // JDK found at $JDK_9
-    FULL_JDK_9(requiresSeparateProcess = true),
-
     // JDK found at $JDK_11
     FULL_JDK_11(requiresSeparateProcess = true),
 

compiler/test-infrastructure-utils/tests/org/jetbrains/kotlin/test/util/KtTestUtil.java

@@ -140,11 +140,6 @@ public class KtTestUtil {
         return getJdkHome("JDK_8", "JDK_18");
     }
 
-    @NotNull
-    public static File getJdk9Home() {
-        return getJdkHome("JDK_9", "JDK_19");
-    }
-
     @NotNull
     public static File getJdk11Home() {
         return getJdkHome("JDK_11");