Adjust lesson template (#704)

* Remove method `getId()` from all lessons as it defaults to the class name

* remove clean up endpoint

* remove unused class `RequestParameter`

* remove unused class `PluginLoadingFailure`

* Move `CourseConfiguration` to lesson package

* Add more content around the lesson template lesson and make it visible as a lesson in WebGoat

* Remove explicit invocation `trackProgress()` inside WebGoat framework so assignments only need to return an `AttackResult`

* Put original solution back as well for SQL string injection

* review comments

* Add

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

@@ -3,6 +3,7 @@ package org.owasp.webgoat.service;
 import org.hamcrest.CoreMatchers;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.owasp.webgoat.assignments.LessonTrackerInterceptor;
 import org.owasp.webgoat.session.Course;
 import org.owasp.webgoat.users.UserService;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -56,6 +57,8 @@ public class LabelServiceTest {
     private Course course;
     @MockBean
     private UserService userService;
+    @MockBean
+    private LessonTrackerInterceptor interceptor;
 
     @Test
     @WithMockUser(username = "guest", password = "guest")

webgoat-container/src/test/java/org/owasp/webgoat/users/UserTrackerRepositoryTest.java

@@ -31,11 +31,6 @@ public class UserTrackerRepositoryTest {
             return "test";
         }
 
-        @Override
-        public String getId() {
-            return "test";
-        }
-
         @Override
         public List<Assignment> getAssignments() {
             Assignment assignment = new Assignment("test", "test", Lists.newArrayList());