Function headless_lms_models::user_exercise_states::get_all_for_user_and_course_instance_or_exam

pub async fn get_all_for_user_and_course_instance_or_exam(
    conn: &mut PgConnection,
    user_id: Uuid,
    course_instance_or_exam_id: CourseInstanceOrExamId
) -> ModelResult<Vec<UserExerciseState>>