Add SkycacheChannelStateAdvisor to shed requests upon overload. This does not have any real effect yet, because nothing is adjusting the request counts yet. The existing solution can block Skyframe or serialization worker threads when the cache is saturated starving CPU cores and build throughput, turning an optional caching optimization into a potential latency bottleneck. Non-blocking load shedding avoids thread parking and queue contention entirely, seamlessly degrading excess work to local evaluation on available cores while keeping network and memory strictly bounded. PiperOrigin-RevId: 968587486 Change-Id: I860d786e5e49e2a1ab6e45729b6f81bc8225cb38
{Fast, Correct} - Choose two
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