Bug 1856035 - Rework the management of font variation settings across...

Bug 1856035 - Rework the management of font variation settings across CoreGraphics and CoreText font instances, on macOS 13 and later only. r=gfx-reviewers,lsalzman, a=dmeehan

Differential Revision: https://phabricator.services.mozilla.com/D191124

Depends on D191123