Adds support for extracting an App Shell from a more concrete prerender response. The server sends down a byte offset that represents the subset of the stream that corresponds to the reusable App Shell. This does _not_ yet implement shell extraction for per-segment prefetch responses. Implementing this adds an additional layer of complexity, because those responses are generated during a separate phase of the build process. We do intend to implement this, but it's a non-essential optimization that can come later. This also does not yet implement shell extraction from a navigation response (the Cached Navigations feature), though both features are based on essentially the same mechanism. I'm deferring this to a subsequent PR because some of the existing implementation needs to be rethought in light of the new App Shells based model; for example, the "static stage" boundary might not make sense to track separately from the App Shell. The main practical upshot of the PR is that if you have a fully statically prerendered page with no dynamic holes, that page's App Shell can now be fetched by the client without incurring any runtime server execution cost: the server will return the full static page, and the client will extract the App Shell from that concrete response. <!-- NEXT_JS_LLM_PR -->
TURBO_TASKS_AVAILABLE_PARALLELISM environment variable that overrides std::thread::available_parallelism callsites (#93995)
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