function initAria() {
    if (isOnServer) return null;
    if (document.readyState === "complete") {
        initAriaOnBrowser();
    } else {
        window.addEventListener("DOMContentLoaded", initAriaOnBrowser);
    }
    return {...INSTRUCTION_IDs};
}
Initializes the static aria instructions so they can be attached to zones
@return {{DND_ZONE_ACTIVE: string, DND_ZONE_DRAG_DISABLED: string} | null} - the IDs for static aria instruction (to be used via aria-describedby) or null on the server