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

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

@@ -0,0 +1,25 @@
+package foo
+
+class A {
+    val s = "sA"
+    fun memBar(other: String): String = s +":memBar:" + other
+}
+
+fun A.extBar(other: String):String = s + ":extBar:" + other
+
+fun box():String {
+    fun A.locExtBar(other: String):String = s + ":locExtBar:" + other
+
+    val a = A()
+
+    var r = (A::memBar)(a, "!!")
+    if (r != "sA:memBar:!!") return r
+
+    r = (A::extBar)(a, "!!")
+    if (r != "sA:extBar:!!") return r
+
+    r = (A::locExtBar)(a, "!!")
+    if (r != "sA:locExtBar:!!") return r
+
+    return "OK"
+}