Function headless_lms_models::library::grading::update_grading_with_single_regrading_result

pub async fn update_grading_with_single_regrading_result(
    conn: &mut PgConnection,
    exercise: &Exercise,
    regrading_submission: &ExerciseTaskRegradingSubmission,
    exercise_task_grading: &ExerciseTaskGrading,
    exercise_task_grading_result: &ExerciseTaskGradingResult
) -> ModelResult<()>