refactor: TaskControllerTest 클래스명 변경

api/src/test/java/com/taskbuddy/api/controller/TestControllerTest.java → api/src/test/java/com/taskbuddy/api/controller/TaskControllerTest.java

@@ -37,7 +37,7 @@
 //TODO IntegrationTest와 UnitTest가 모였을 때 Fast 태그로 나누자
 @SpringBootTest
 @ExtendWith({RestDocumentationExtension.class})
-public class TestControllerTest {
+public class TaskControllerTest {
  private MockMvc mockMvc;
  private ObjectMapper objectMapper;