Enqueue scripts when comment form is displayed only

We are loading comment form via Ajax and there is no reason to enqueue scripts until the comment form is displayed.

For example, Simple Cloudflare Turnstile plugin has been using comment_form_after hook to achieve that:
https://plugins.trac.ww.wp.xz.cn/browser/simple-cloudflare-turnstile/trunk/inc/wordpress.php#L157