Fixed bug where user wasn't added to lesson class properly if they were already in the staff group. Also tried to eliminate some lazy loading errors in addStaffToLesson and addLearnerToLesson but wasn't able to eliminate the error.
turn off lazy loading for integration.we should modify addStaffMember and addLearner method in LessonServiceto eagerly load the related objects so that we can turn on lazy loading later onfor best performance