refactor(audit): shorten CLI's function bodies

[pbeza]

This commit addresses finding B1 from the Trail of Bits audit titled 'Functions with too many lines.'

[pbeza]

@robin-near, could you review it again, please? BTW, CI checks seem to be flaky – I had to manually re-run the tests to get them to pass.

[robin-near]

wait I'm not sure why _auto_abort_metrics needs to be in here - we can just have the run() function keep that as a local variable. Don't need to move it in here.

[pbeza]

I moved it here:

mpc/node/src/mpc_client.rs

Lines 61 to 75 in 972150d

	pub async fn run(
	self,
	channel_receiver: mpsc::Receiver<NetworkTaskChannel>,
	mut sign_request_receiver: tokio::sync::OwnedMutexGuard<
	mpsc::UnboundedReceiver<ChainSignatureRequest>,
	>,
	chain_txn_sender: mpsc::Sender<ChainSendTransactionRequest>,
	) -> anyhow::Result<()> {
	let client = self.client.clone();
	let metrics_emitter = tracking::spawn("periodically emits metrics", async move {
	loop {
	client.emit_metrics();
	tokio::time::sleep(std::time::Duration::from_secs(5)).await;
	}
	});

Lemme know if this is what you meant.