This PR corrects the file names of chunks in the flight manifest.
Previously we assume that the chunk file is always named as
`(requiredChunk.name || requiredChunk.id) + '-' + requiredChunk.hash`
and located in `static/chunks`. This isn't always true (see the comment)
especially when a chunk was generated via `import()`. Another mistake
was that we assume that one chunk only generates one file, but it's
actually possible that it depends on multiple files.
This should address many of the "Chunk failed to load" errors.
Closes [#47173](https://github.com/vercel/next.js/issues/47173), fixes
NEXT-847
fix#47173
1827f36e5e