JS: create new common directory for all generated tests, migrate several tests there

js/js.translator/testData/box/classObject/defaultObjectSameNamesAsInOuter.kt

@@ -0,0 +1,20 @@
+package foo
+
+class A {
+    private val p: Int
+        get() = 4
+
+    companion object B {
+        val p: Int
+            get() = 6
+    }
+
+    fun a() = p + B.p
+}
+
+
+fun box(): String {
+    if (A().a() != 10) return "Fail"
+
+    return "OK"
+}