Reflection: deprecate KClass.defaultType

Its semantics were unclear and its javaType was implemented incorrectly (it
should have returned ParameterizedType with star projections for generic type)

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java

@@ -11892,12 +11892,6 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                 doTest(fileName);
             }
 
-            @TestMetadata("defaultType.kt")
-            public void testDefaultType() throws Exception {
-                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/classes/defaultType.kt");
-                doTest(fileName);
-            }
-
             @TestMetadata("jvmName.kt")
             public void testJvmName() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/classes/jvmName.kt");