[MICROBA-1209]
Part of the modulestore cleanup/removal in the certificates app. The function `list_with_level_from_course_overview` was temporary. Cleaning this up. Modifying the original `list_with_level` to accept a course-id/course-key as it doesn't actually need the entire course object.
* Update `list_with_level` function to accept a course run id/course-key
* Remove `list_with_level_from_course_key` function (and update any functions using it to use `list_with_level` again)
d4f3e11092