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

js/js.translator/testData/box/closure/closureValToScopeWithSameNameDeclaration.kt

@@ -0,0 +1,30 @@
+package foo
+
+val f = true
+
+fun box(): String {
+    val bar = "test "
+    val boo = "another "
+
+    fun baz(): String {
+        var result = bar
+
+        if (f) {
+            val bar = 42
+            result += bar
+
+            val boo = 7
+            result += boo
+        }
+
+        result += boo
+        result += bar
+
+        return result
+    }
+
+    val r = baz()
+    if (r != "test 427another test ") return r;
+
+    return "OK"
+}