Use ProxiedAsset instead of css_chunk_root_path to expose RSC CSS chunks (#48946)
See https://github.com/vercel/turbo/pull/4740
This enables RSC CSS HMR. The `css_chunk_root_path` way somehow broke
the propagation of invalidation for CSS chunks.
This also updates Turbopack with the following changes:
* https://github.com/vercel/turbo/pull/4738 <!-- Tobias Koppers -
improve commonjs esm interop and node ESM -->
* https://github.com/vercel/turbo/pull/4740 <!-- Alex Kirszenberg -
Replace css_chunk_root_path with ProxiedAsset -->
* https://github.com/vercel/turbo/pull/4741 <!-- Tobias Koppers - add
svg size extraction -->
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Co-authored-by: Tobias Koppers <tobias.koppers@googlemail.com>