[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/interfaces/inheritJavaInterface.kt

@@ -0,0 +1,27 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// MODULE: lib
+// FILE: A.java
+
+interface A {
+    void foo();
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+internal interface B : A {
+    fun bar() = 1
+}
+
+internal interface C : B
+
+internal class D : C {
+    override fun foo() {}
+}
+
+fun box(): String {
+    val d = D()
+    d.foo()
+    d.bar()
+    return "OK"
+}