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-lessons/missing-function-ac/src/test/java/org/owasp/webgoat/missing_ac/MissingFunctionACHiddenMenusTest.java

@@ -44,7 +44,6 @@ public class MissingFunctionACHiddenMenusTest extends AssignmentEndpointTest {
     public void setup() {
         MissingFunctionACHiddenMenus hiddenMenus = new MissingFunctionACHiddenMenus();
         init(hiddenMenus);
-        when(webSession.getCurrentLesson()).thenReturn(new MissingFunctionAC());
         this.mockMvc = standaloneSetup(hiddenMenus).build();
     }
 

webgoat-lessons/missing-function-ac/src/test/java/org/owasp/webgoat/missing_ac/MissingFunctionYourHashTest.java

@@ -57,7 +57,6 @@ public class MissingFunctionYourHashTest extends AssignmentEndpointTest {
         this.mockDisplayUser = new DisplayUser(new WebGoatUser("user", "userPass"));
         ReflectionTestUtils.setField(yourHashTest, "userService", userService);
         when(userService.loadUserByUsername(any())).thenReturn(new WebGoatUser("user", "userPass"));
-        when(webSession.getCurrentLesson()).thenReturn(new MissingFunctionAC());
     }
 
     @Test