refactor: exam description varchar to text

Author: alstn113

server/src/main/resources/db/migration/V2__update_description_length.sql

@@ -0,0 +1 @@
+ALTER TABLE EXAM ALTER COLUMN DESCRIPTION TYPE TEXT;

server/src/test/java/com/fluffy/integration/exam/ExamServiceIntegrationTest.java

@@ -25,10 +25,12 @@
 import com.fluffy.integration.AbstractIntegrationTest;
 import com.fluffy.support.data.MemberTestData;
 import java.util.List;
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 
+@Disabled("동시성 문제 해결 방법 미정으로 테스트 비활성화합니다.")
 class ExamServiceIntegrationTest extends AbstractIntegrationTest {
 
     @Autowired

server/src/test/java/com/fluffy/integration/submission/SubmissionServiceIntegrationTest.java

@@ -24,6 +24,7 @@
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 
+@Disabled("동시성 문제 해결 방법 미정으로 테스트 비활성화합니다.")
 class SubmissionServiceIntegrationTest extends AbstractIntegrationTest {
 
     @Autowired
@@ -39,7 +40,6 @@ class SubmissionServiceIntegrationTest extends AbstractIntegrationTest {
     private SubmissionRepository submissionRepository;
 
     @Test
-    @Disabled("동시성 문제 해결 방법 미정으로 테스트 비활성화합니다.")
     @DisplayName("시험을 제출할 수 있다.")
     void submit() throws InterruptedException {
         // given