Updates `wp_register_font_collection()` and `WP_Font_Collection` so that only font families can be loaded from a file or URL.
All metadata, such as name, description, and list of font categories, needs to be passed directly in PHP so that it can be properly localized.
Props swissspidy, mmaattiiaass, grantmkin, youknowriad.
Fixes#60509.
Built from https://develop.svn.wordpress.org/trunk@57686
git-svn-id: http://core.svn.wordpress.org/trunk@57187 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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