This commit fixes the incorrect saving of the user's full name in the
credentials service by modifying how the COURSE_PASSING_STATUS_UPDATED
and CCX_COURSE_PASSING_STATUS_UPDATED events are emitted.
Previously, we had been using Django's standard User.get_full_name()
to fetch the user's full name. However, Open edX uses the convention of
storing the full name in user.profile.name and leaves the User's first
and last name fields blank. (This is to better accommodate the wide
range of international conventions regarding names.)
5df4564173