next.js

1aee9358 - Align reactRoot config between server and webpack config (#34328)

Align reactRoot config between server and webpack config (#34328) ### Changes * node server and webpack should share the same logic: auto detect react 18 and enable `reactRoot` * fallback `_error` should use functional document if concurrent rendering is enabled ### Test * Remove the hard code `reactRoot: true` in test suite * Test some react-18 test suite with nodejs runtime