Consider using basic auth in https healh check.

[peterwilsoncc]

If the WordPress dashboard is behind basic auth, in some checks the site health component will pass the authentication through to background HTTP requests (the wp-cron tests does this for example).

The https detection test does not do this, it would be worth discussing whether it should:

• always do this
• send a second request with basic auth if the first request fails
• something similar not listed here :)

Follow up to #52783.

[TimothyBlynJacobs]

I think it'd be worth always doing this.