Python: preserve msg argument on aio call cancel #36637
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When performing an RPC call using
grpc.aio, and cancelling - withmsgargument - a task containing the RPC call, gRPC swallows themsgargument and re-raises asyncio.CancelledError with nomsgargument. This prevents user from usingmsgargument to log the reason for cancelling.This PR fixes that, and provides a unit tests that verify the correct behavior.