Add the ability to delete all carts

Because carts are often correlated to sessions and may not work outside of production, let's delete all carts and their related entities. We can add an option to skip cart deletion, but I think it's reasonable to delete them all by default.

Note: I don't think we should delete all draft orders ... those created by admins would presumably still be editable by admins after sanitization. Just want to avoid things like an issue we had recently with Stripe, where a payment intent for live mode was erroring out checkout in dev.