Fix:트랜잭션 추가

Author: skyeong42

src/main/java/cmf/commitField/domain/chat/chatMessage/service/ChatMessageServiceImpl.java

@@ -34,7 +34,7 @@ public class ChatMessageServiceImpl implements ChatMessageService {
     private final UserChatRoomRepository userChatRoomRepository;
 
     @Override
-//    @Transactional
+    @Transactional
     public ChatMsgResponse sendMessage(ChatMsgRequest message, Long userId, Long roomId) {
         User findUser = userRepository.findById(userId)
                 .orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUND_USER));