next.js

79572631 - [node-webstreams] Remove unused App externals from next-server bundler config (#81039)

[node-webstreams] Remove unused App externals from next-server bundler config (#81039) These externals have no effect since we don't import the legacy `react-dom/server` APIs in `next-server` anyway. We only import the modern APIs since we alias `react-dom/server` to `build/webpack/alias/react-dom-server-edge.js` which does not import from the legacy entrypoint. ## Test plan - [x] `compiled/next-server` remained unchanged