Rethrow asio operation cancellation exception as fc::canceled_exception

[abitmore]

Rethrow asio operation cancellation exception boost::asio::error::operation_aborted as fc::canceled_exception instead of fc::exception to fix errors like below.

p2p:connect_to_task connect_to ] Failed to connect to remote endpoint x.x.x.x:x from local endpoint 0.0.0.0:x, will connect using an OS-selected endpoint: {"code":0,"name":"exception","message":"unspecified","stack":[{"context":{"level":"error","file":"asio.cpp","line":62,"method":"error_handler","hostname":"","thread_name":"fc::asio worker #1","timestamp":"x-x-xTx:x:x"},"format":"${message} ","data":{"message":"Operation canceled"}}]}

[sonarqubecloud]

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