Add command to fetch new Flipper version

Summary: It is a copy-paste of what we have in jest-e2e

Reviewed By: passy

Differential Revision: D51527040

fbshipit-source-id: 36b62edee006580023e9ce2cd309dddfd0dbce84

desktop/flipper-server-core/src/FlipperServerImpl.tsx

@@ -60,6 +60,7 @@ import {jfUpload} from './fb-stubs/jf';
 import path from 'path';
 import {movePWA} from './utils/findInstallation';
 import GK from './fb-stubs/GK';
+import {fetchNewVersion} from './fb-stubs/fetchNewVersion';
 
 const {access, copyFile, mkdir, unlink, stat, readlink, readFile, writeFile} =
   promises;
@@ -632,6 +633,7 @@ export class FlipperServerImpl implements FlipperServer {
     'move-pwa': async () => {
       await movePWA();
     },
+    'fetch-new-version': fetchNewVersion,
   };
 
   registerDevice(device: ServerDevice) {

desktop/flipper-server-core/src/fb-stubs/fetchNewVersion.tsx

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+export const fetchNewVersion = async (): Promise<void> => {};