CLAP-407 Fix: 작업 조회시 카운트쿼리 수정

<footer>
- #526

Author: hyoseong-Choi

src/main/java/clap/server/adapter/outbound/persistense/repository/task/TaskCustomRepositoryImpl.java

@@ -201,6 +201,8 @@ private Page<TaskEntity> getTasksPage(Pageable pageable, BooleanBuilder builder,
         long total = queryFactory
                 .select(taskEntity.count())
                 .from(taskEntity)
+                .leftJoin(taskEntity.processor)
+                .leftJoin(taskEntity.requester)
                 .where(builder)
                 .fetchOne();
         return new PageImpl<>(result, pageable, total);