Move middleware files into react-native-internal-cli

Summary: These files are used by `js1 run`. By copying them close to `runServer.js` we can soon remove `local-cli`.

Reviewed By: TheSavior

Differential Revision: D13337487

fbshipit-source-id: ef80317580d5a9b3e560ad1f27b681887cf50b6b

local-cli/server/middleware/unless.js

@@ -1,20 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @format
- */
-
-'use strict';
-
-module.exports = (url, middleware) => {
-  return (req, res, next) => {
-    if (req.url === url || req.url.startsWith(url + '/')) {
-      middleware(req, res, next);
-    } else {
-      next();
-    }
-  };
-};