[refactor] 친구관계 - 본인 친구추가 안되도록 수정, 양방향 친구 되어있는 경우 한번에 삭제 되도록 수정, 중복 친구관계 불가능하게 수정 #146
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📝작업 내용
친구관계 본인이 본인 추가 하면 에러 메세지 나게 했습니다
양방향 친구 되어있는 경우 한번에 삭제 되도록 수정 2/5 , 5/2 되어있으면 한번에 둘다 삭제하도록 변경
중복 친구 불가능하게 수정