Remove babel transforms for flipper-server

Summary: Flipper server itself requires no babel transforms. We applied extra transforms only for the bundled plugins. However, we pack and ship all plugins in the /static folder. They are always available on the FS. Therefore we could stop bundling any plugins into flipper-server's source code.

Reviewed By: lblasa

Differential Revision: D38910251

fbshipit-source-id: b3e9fe5ae2ab69ce5579b01b6793ebf7e88baf66

desktop/scripts/start-dev-server.tsx

@@ -23,7 +23,7 @@ import {hostname} from 'os';
 import {
   compileMain,
   prepareDefaultPlugins,
-  prepareHeadlessPlugins,
+  buildHeadlessPlugins,
 } from './build-utils';
 import Watchman from './watchman';
 // @ts-ignore no typings for metro
@@ -445,7 +445,7 @@ function checkDevServer() {
   await prepareDefaultPlugins(
     process.env.FLIPPER_RELEASE_CHANNEL === 'insiders',
   );
-  await prepareHeadlessPlugins();
+  await buildHeadlessPlugins(true);
   await ensurePluginFoldersWatchable();
   const port = await detect(DEFAULT_PORT);
   const {app, server} = await startAssetServer(port);