Handle clap errors manually and don't reset SIGPIPE (#6012)

Instead of resetting `SIGPIPE` to the system default handler, we now
handle a clap error manually and ignore any error when writing to
`stdout`/`stderr`. In this way, the node does not silently stops when it
encounters a `SIGPIPE` in normal mode and we still support piping of the
cli output.

substrate/bin/node/cli/src/command.rs

@@ -63,8 +63,6 @@ impl SubstrateCli for Cli {
 
 /// Parse command line arguments into service configuration.
 pub fn run() -> Result<()> {
-	sc_cli::reset_signal_pipe_handler()?;
-
 	let cli = Cli::from_args();
 
 	match &cli.subcommand {