[light classes] drop old light classes and backend: iteration #2

drop javaFileStub and fix tests

^KT-48773

compiler/testData/asJava/script/ide/InnerClasses.java

@@ -1,5 +1,5 @@
 public class InnerClasses /* InnerClasses*/ extends kotlin.script.templates.standard.ScriptTemplateWithArgs {
-  public  InnerClasses();//  .ctor()
+  public  InnerClasses(java.lang.String[]);//  .ctor(java.lang.String[])
 
   public static final void main(java.lang.String[]);//  main(java.lang.String[])
 
@@ -23,4 +23,4 @@ public static final class Baz /* InnerClasses.Bar.Baz*/ {
 
   public final void doSomething();//  doSomething()
 
-}}}
+}}}