The current shard_split_shutdown_while_blocking_reads.js test doesn't handle properly when the readThread expects to fail due to the primary shutting down.

We should handle the error within the thread in order to properly fix this behavior in our ASAN builds.

We should add handling the `HostUnreachable` error code since in ASAN builds we might not get `InterruptedAtShutdown` on time and instead get `HostUnreachable`.