backend: Change COMPLETE message error to info

COMPLETE messages are not critical for functionality since the client
will continue to receive updates even if the COMPLETE message fails.
Changed the log level to reduce noise in error logs while maintaining
visibility through info logs.

Signed-off-by: Kautilya Tripathi <[email protected]>

backend/cmd/multiplexer.go

@@ -603,7 +603,7 @@ func (m *Multiplexer) sendCompleteMessage(conn *Connection, clientConn *websocke
 	defer conn.writeMu.Unlock()
 
 	if err := clientConn.WriteJSON(completeMsg); err != nil {
-		logger.Log(logger.LevelError, nil, err, "writing complete message")
+		logger.Log(logger.LevelInfo, nil, err, "writing complete message")
 		return err
 	}