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

js/js.translator/testData/box/callableReference/function/classMemberFromTopLevelStringNoArgs.kt

@@ -0,0 +1,12 @@
+// This test was adapted from compiler/testData/codegen/box/callableReference/function/.
+package foo
+
+class A {
+    fun foo() = "OK"
+}
+
+fun box(): String {
+    val x = A::foo
+    var r = x(A())
+    return r
+}