next.js

503b4779 - Warn metadataBase missing in standalone mode or non vercel deployment (#66296)

Warn metadataBase missing in standalone mode or non vercel deployment (#66296) ### What Change the metadataBase missing warning for all cases to only warn in standalone mode or the non-vercel deployment. ### Why In vercel deployments, previous concern was that you might not discover you missed that metadataBase when you deploy. But now we have sth fallback on production deployments. So we only need to warn in non-vercel deployment. Standalone is usually for self-hoist, we always warn users to set the `metadataBase` to make sure the domain can be properly resolved. [x-ref](https://vercel.slack.com/archives/C03S8ED1DKM/p1716926825853389?thread_ts=1716923373.484329&cid=C03S8ED1DKM)