fix(agent/stream): handle EOF error in UDP server connection

- Updated error handling in the UDP server to ignore io.EOF errors when reading from client connections.
- Added a check to return early if no bytes are read from the client connection.
- Ensured proper closure of tcpListener in the main.go file during cancellation.

agent/cmd/main.go

@@ -192,9 +192,9 @@ Tips:
 	{
 		subtask := t.Subtask("agent-tls-mux", true)
 		t.OnCancel("stop_mux", func() {
-			_ = tcpListener.Close()
 			_ = httpLn.Close()
 			_ = streamLn.Close()
+			_ = tcpListener.Close()
 		})
 		go func() {
 			defer subtask.Finish(subtask.FinishCause())