Discourse AI לא מכבד את הקבוצה "everyone"

[martin (Martin Brennan)]

Small PR here to do it, along with fixing this bug:

@RGJ

return false if (SiteSetting.ai_bot_allowed_groups_map & post.user.group_ids).blank?

DEV: Disallow `everyone` from ai_bot_allowed_groups (#42944)