Summary

1. In webpack, there is no need to add HotUpdateChunk to compilation.chunks, because HotUpdateChunk is no longer used after generating the manifest.

   However, in Rspack, we need to add HotUpdateChunk to compilation.chunk_by_ukey because during the manifest generation, HotUpdateChunk is passed to various plugins via the ukey. The plugins then use the ukey to query compilation.chunk_by_ukey to get the HotUpdateChunk instance.

   Therefore, in Rspack, after the manifest is generated, we need to manually remove the HotUpdateChunk from compilation.chunks.

2. In webpack, compilation.chunkGraph uses a WeakMap to maintain the relationship between Chunks and Modules.
   This means the lifecycle of these data is tied to the Chunk, and they are garbage-collected when the Chunk is.

   In Rspack, we need to manually clean up the data in compilation.chunk_graph after HotUpdateChunk is used.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).