test : memberTest 에 transactional 재 추가

- member test에는 각각의 트랜잭션이 적용되어 rollback이 필요

backend/src/test/java/com/ssafy/home/domain/member/service/MemberServiceTest.java

@@ -12,10 +12,12 @@
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.transaction.annotation.Transactional;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 @DisplayName("[회원가입, ...]")
+@Transactional
 class MemberServiceTest extends TestConfig {
 
     private final MemberService memberService;