test: move platform-server integration test (#22810)

Now it lives in our standard location for tests against npm packages

PR Close #22810

integration/platform-server/webpack.client.config.js

@@ -0,0 +1,19 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+const path = require('path');
+
+module.exports = {
+  entry: {
+    helloworld: './built/src/helloworld/client.js',
+    transferstate: './built/src/transferstate/client.js',
+  },
+  output: {path: path.join(__dirname, 'built'), filename: '[name]-bundle.js'},
+  module: {loaders: [{test: /\.js$/, loader: 'babel-loader?presets[]=es2015'}]},
+  resolve: {extensions: ['.js']}
+};