Revert "fix hibernate no session with left join fetch"

This reverts commit bc9aa84.

Author: ahmetsenturk

src/main/java/de/tum/cit/aet/artemis/atlas/repository/CourseLearnerProfileRepository.java

@@ -48,7 +48,6 @@ public interface CourseLearnerProfileRepository extends ArtemisJpaRepository<Cou
     @Query("""
                 SELECT clp
                 FROM CourseLearnerProfile clp
-                LEFT JOIN FETCH clp.course
                 WHERE clp.learnerProfile.user.login = :login AND clp.course = :course
             """)
     Optional<CourseLearnerProfile> findByLoginAndCourse(@Param("login") String login, @Param("course") Course course);