fix: remove course display name and change how to get course ID

Author: mariajgrimaldi

common/djangoapps/student/models.py

@@ -1618,8 +1618,7 @@ def enroll(cls, user, course_key, mode=None, check_access=False, can_upgrade=Fal
                     is_active=user.is_active,
                 ),
                 course=CourseData(
-                    course_key=enrollment.course.id,
-                    display_name=enrollment.course.display_name
+                    course_key=course_key,
                 ),
                 mode=enrollment.mode,
                 is_active=enrollment.is_active,

common/djangoapps/student/tests/test_events.py

@@ -238,7 +238,6 @@ def test_enrollment_created_event_emitted(self, enrollment_event):
                 ),
                 course=CourseData(
                     course_key=self.course.id,
-                    display_name=self.course.display_name
                 ),
                 mode='audit',
                 is_active=True,