refactor: replace unbounded control snapshot channel with tokio watch

src/main.rs

@@ -40,6 +40,7 @@ use std::sync::{Arc, RwLock};
 use std::thread;
 use std::thread::{JoinHandle, sleep};
 use std::time::{Duration, Instant};
+use tokio::sync::watch;
 
 struct ReflectorSetup {
     peers: Arc<RwLock<Vec<SocketAddr>>>,
@@ -345,7 +346,7 @@ fn run(settings: &Settings) -> anyhow::Result<()> {
         reselection_enabled,
     } = setup_reflectors(settings)?;
 
-    let (control_snapshot_tx, control_snapshot_rx) = flume::unbounded();
+    let (control_snapshot_tx, control_snapshot_rx) = watch::channel(None);
     let (error_tx, error_rx) = flume::unbounded::<anyhow::Error>();
     let (icmp_binding_tx, icmp_binding_rx) = flume::unbounded();
     #[cfg(feature = "irtt")]