Gate Flight SSR test

This should ideally be explicitly asserted on but some bad source mapping
Node tool is injecting a bad prepareStackTrace.

Author: sebmarkbage

packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMEdge-test.js

@@ -931,6 +931,7 @@ describe('ReactFlightDOMEdge', () => {
     );
   });
 
+  // @gate __DEV__
   it('supports server components in ssr component stacks', async () => {
     let reject;
     const promise = new Promise((_, r) => (reject = r));