Use try with resources instead of try (#921)

* Use try with resources instead of try

* Remove unused lesson

* Remove unused fields

webgoat-container/src/main/java/org/owasp/webgoat/assignments/AssignmentEndpoint.java

@@ -34,8 +34,6 @@ import org.springframework.beans.factory.annotation.Autowired;
 
 public abstract class AssignmentEndpoint {
 
-    @Autowired
-    private UserTrackerRepository userTrackerRepository;
     @Autowired
     private WebSession webSession;
     @Autowired

webgoat-container/src/test/java/org/owasp/webgoat/service/LabelServiceTest.java

@@ -53,12 +53,6 @@ public class LabelServiceTest {
 
     @Autowired
     public MockMvc mockMvc;
-    @MockBean
-    private Course course;
-    @MockBean
-    private UserService userService;
-    @MockBean
-    private LessonTrackerInterceptor interceptor;
 
     @Test
     @WithMockUser(username = "guest", password = "guest")