This changeset modifies the Site Health panel for HTTPS to provide more accurate recommendations based on whether the environment is already set up for HTTPS.
* Introduces `wp_is_using_https()` to check whether the site is configured to use HTTPS (via its Site Address and WordPress Address).
* Introduces `wp_is_https_supported()` to check whether the environment supports HTTPS. This relies on a cron job which periodically checks support using a loopback request.
Props Clorith, flixos90, miinasikk, westonruter.
Fixes#47577.
Built from https://develop.svn.wordpress.org/trunk@49904
git-svn-id: http://core.svn.wordpress.org/trunk@49603 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Felix Arntz