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

js/js.translator/testData/box/defaultArguments/enumWithOneDefArg.kt

@@ -0,0 +1,12 @@
+package foo
+
+enum class Foo(val a: Int = 1, val b: String) {
+    B(2, "b"),
+    C(b = "b")
+}
+
+fun box(): String {
+    if (Foo.B.a != 2 || Foo.B.b != "b") return "fail1"
+    if (Foo.C.a != 1 || Foo.C.b != "b") return "fail2"
+    return "OK"
+}