[Test] Properly merge box against java testdata into codegen/box

Previous commit about it was 3199ce03 and it was completely wrong

compiler/testData/codegen/box/innerClass/kt3532.kt

@@ -0,0 +1,15 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// MODULE: lib
+// FILE: Foo.java
+
+public class Foo {
+    public class Inner { }
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+fun box(): String {
+    Foo().Inner()
+    return "OK"
+}

compiler/testData/codegen/box/innerClass/kt3812.kt

@@ -0,0 +1,21 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// MODULE: lib
+// FILE: Foo.java
+
+public class Foo {
+    public class Inner {
+
+    }
+
+    public class Inner$ {
+    }
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+fun box(): String {
+    Foo().Inner()
+    Foo().`Inner$`()
+    return "OK"
+}

compiler/testData/codegen/box/innerClass/kt4036.kt

@@ -0,0 +1,20 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// MODULE: lib
+// FILE: Foo.java
+
+public class Foo {
+    public class Inner1$class {
+    }
+
+    public class Inner2$class {
+    }
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+fun box(): String {
+    Foo().`Inner1$class`()
+    Foo().`Inner2$class`()
+    return "OK"
+}