Function headless_lms_models::pages::upsert_exercise_slides

async fn upsert_exercise_slides(
    conn: &mut PgConnection,
    remapped_exercises: &HashMap<Uuid, Exercise>,
    existing_slide_ids: &[Uuid],
    slide_updates: &[CmsPageExerciseSlide],
    retain_exercise_ids: bool
) -> ModelResult<HashMap<Uuid, CmsPageExerciseSlide>>

Remaps ids from updates to exercise slides that may have their ids changed.