CLAP-418 HotFix: 작업 mock 데이터 createdAt 추가

Author: parkjaehak

src/test/java/clap/server/TestDataFactory.java

@@ -194,6 +194,7 @@ public static Task createTask(Long id, String taskCode, String title, TaskStatus
                 .requester(createUser())
                 .processor(processor)
                 .label(createLabel())
+                .createdAt(LocalDateTime.now())
                 .build();
     }