Turbopack: accept ChunkGroup in entry_chunk_group (#90821)
Now all of the chunking context functions accept `ChunkGroup`
The names are bad, but `entry_chunk_group` and `ChunkGroup::Entry` have nothing to do with each other:
- `entry_chunk_group` means: it's a standalone file where `node path/to/chunk.js` will execute it
- `ChunkGroup::Entry` = it's the top-level chunk group
For example a `evaluated_chunk_group(ChunkGroup::Entry)` is also fine
