Ignore: ✨ Leave Chat Room API

[psychology50]

작업 이유

• Chat members can leave a chat room.
• However, the chat room master cannot leave if at least one other member remains in the room.

작업 사항

• Implemented business logic for leaving chat rooms.
• Added service unit tests.
• Added service integration tests.

리뷰어가 중점적으로 확인해야 하는 부분

• None.

발견한 이슈

• Temporarily disabled the ChatRoomDetailIntegrationTest due to a malfunction:
  • When a ChatMember tries to add itself to the ChatRoom fields after the session is closed, a failed to lazily initialize error occurs
  • While I could use ChatMemberJoinService to address this, it has too many dependencies and does not return the ChatMember entity.
  • I plan to address these issues in the next task.