Validate: map netlify.com to netlify.app

[MattIPv4]

https://github.com/js-org/js.org/pull/8480 migrated all netlify.com usage to netlify.app, and as such we should update the CNAME parsing logic in validation/cleanup to automatically map netlify.com subdomains to netlify.app, similar to how we map Vercel subdomains.

js.org-cleanup/src/util/cnames.js

Lines 76 to 77 in 276ab10

	// Convert vercel.app to cname.vercel-dns.com
	if (target.endsWith('.vercel.app')) target = 'cname.vercel-dns.com';