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

js/js.translator/testData/box/inline/innerOuterThis.kt

@@ -0,0 +1,19 @@
+package foo
+
+inline fun<T> with1(value: T, p: T.() -> Unit) = value.p()
+
+class A(val expected: String) {
+    val b = B()
+
+    fun foo(): A {
+        with1(b) {
+            y = expected
+        }
+        return this
+    }
+}
+class B() {
+    var y = ""
+}
+
+fun box() = A("OK").foo().b.y