test: UserRepositoryTest flaky 실패 수정 (정렬 없는 페이지 조회)

[kangcheolung]

Summary

#226 작업 검증 중(필터 없는 전체 테스트 실행) 발견한 flaky 테스트를 수정합니다.

UserRepositoryTest.findAdminUsers_*가 PageRequest.of(0, 20)으로 페이지를 조회하는데 정렬(Sort) 기준이 없었습니다. docgrid_test 스키마는 여러 @SpringBootTest 통합 테스트가 커밋한 row가 정리되지 않고 계속 쌓이는 구조라(별도 이슈 후보), row가 20개를 넘어가면 "1페이지 20개"가 어떤 20개인지 PostgreSQL이 보장해주지 않습니다. 그래서 테스트가 방금 만든 row가 그 안에 포함되는지 매번 운에 달려 있었습니다.

Changes

• id 내림차순 정렬(Sort.by(Sort.Direction.DESC, "id"))을 명시해서, 방금 생성한(=가장 큰 id) row가 항상 1페이지에 포함되도록 고정했습니다.

Test plan

• ./backend/gradlew -p backend test --tests "...UserRepositoryTest" 단독 실행 통과
• 스키마에 30개 row를 추가로 넣어 오염 상황을 재현한 뒤(총 32개) 재실행 → 통과 확인 (수정 전이었다면 실패했을 상황)
• 재현용으로 넣었던 row는 다시 정리함
• ./backend/gradlew -p backend test --tests "com.opensource.docgrid.domain.user.*" --tests "com.opensource.docgrid.domain.auth.*" 전체 통과

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Reviewing files that changed from the base of the PR and between df7f9e5 and 0b93f3a.

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• backend/src/test/java/com/opensource/docgrid/domain/user/repository/UserRepositoryTest.java

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