[KAPT] Migrate kapt tests to new test infrastructure

plugins/kapt3/kapt3-compiler/testData/converter/nestedClasses2.kt

@@ -1,3 +1,6 @@
+// EXPECTED_ERROR: class J$B is public, should be declared in a file named J$B.java
+// EXPECTED_ERROR: class JavaClass is public, should be declared in a file named JavaClass.java
+
 // FILE: JavaClass.java
 public class JavaClass {
     public class Foo {
@@ -5,7 +8,7 @@ public class JavaClass {
     }
 }
 
-//FILE: J$B.java
+// FILE: J$B.java
 public class J$B {
     public class C {}
 
@@ -76,6 +79,3 @@ class Test1(val zoo: Foo.Bar.Zoo) : Foo.Bar(), IFoo.IBar, IFoo.IBar.IZoo {
     fun a(): Thread.State = Thread.State.NEW
     fun b(foo: JavaClass.Foo, bar: JavaClass.Foo.Bar) {}
 }
-
-// EXPECTED_ERROR class J$B is public, should be declared in a file named J$B.java
-// EXPECTED_ERROR class JavaClass is public, should be declared in a file named JavaClass.java