Add overflow guard in GrpcCacheClient to detect server ignoring `read_offset`. When retrying a download with `read_offset > 0`, some remote cache servers may ignore `read_offset` and stream from offset 0. Extract `readOffset` and detect when received bytes exceed the expected digest size, cancel the gRPC request stream, and fail immediately with an explicit `IOException` rather than corrupting the output stream and hash. Part of https://github.com/bazelbuild/bazel/issues/19005. PiperOrigin-RevId: 969885342 Change-Id: Ida0841c67fb52146f0f0d2ed0f3fd76c9feb519b
{Fast, Correct} - Choose two
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