Update Name::new to just take in one arg

Co-authored-by: Willem Wyndham <willem@ahalabs.dev>

cmd/soroban-cli/src/commands/network/container/start.rs

@@ -164,7 +164,7 @@ impl Cmd {
     }
 
     fn container_name(&self) -> Name {
-        Name::new(self.name.clone(), Some(self.network))
+        Name::new(self.name.cloned().unwrap_or(self.network))
     }
 
     fn print_log_message(&self) {