[KAPT] Migrate kapt tests to new test infrastructure

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

@@ -1,3 +1,5 @@
+// EXPECTED_ERROR: class J$B is public, should be declared in a file named J$B.java
+
 // FILE: test/JavaClass.java
 package test;
 
@@ -7,7 +9,7 @@ class JavaClass {
     }
 }
 
-//FILE: test/J$B.java
+// FILE: test/J$B.java
 package test;
 
 public class J$B {
@@ -82,5 +84,3 @@ class Test1(val zoo: Foo.Bar.Zoo) : Foo.Bar(), IFoo.IBar, IFoo.IBar.IZoo {
     fun a(): Thread.State = Thread.State.NEW
     fun b(foo: JavaClass.Foo, bar: JavaClass.Foo.Bar) {}
 }
-
-// EXPECTED_ERROR class J$B is public, should be declared in a file named J$B.java