Fix grpc connection pool race condition (https://github.com/bazelbuild/bazel/pull/29684) Previously calling `withChannelConnection` claimed and closed a connection from the `dynamicConnectionPool` instantly, even if there were still remote exec requests in flight. This mean the connection went back into the pool and would be reused by bazel even if it already had the maximum number of MAX_CONCURRENT_STREAMS in flight. The end result is that when you set `--jobs=500` your number of concurrent remote exec actions could still be gated by `MAX_CONCURRENT_STREAMS` over a single connection. This seems to race based on how quickly bazel ends up creating another connection before it closes the first one. Related: https://github.com/bazelbuild/bazel/issues/11801 Closes #29684. PiperOrigin-RevId: 925216366 Change-Id: Ic7744c6a92bbeb1df2ea5faeb83869403ef5dd96
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