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

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

@@ -0,0 +1,17 @@
+// This test was adapted from compiler/testData/codegen/box/callableReference/function/.
+package foo
+
+class A {
+    var result = "Fail"
+    
+    fun foo(newResult: String) {
+        result = newResult
+    }
+}
+
+fun box(): String {
+    val a = A()
+    val x = A::foo
+    x(a, "OK")
+    return a.result
+}