3.19 - Preload Fonts - Meta generator part

[piotrbak]

User Story

As a user, I’d like to see the feature added to wpr meta once applied

Acceptance Criteria

• When the feature is applied (the markup is added to the HTML), We’ll add this fact to our meta tag under wpr-preload-fonts

[Miraeld]

Scope a solution

⚠ This grooming is based on #7302 for relative file modification ⚠

In https://github.com/wp-media/wp-rocket/blob/66e41dc48a2799df15e1b330d107beef9ecfb73b/inc/Engine/Media/PreloadFonts/Frontend/Controller.php
Add the following after class declaration:
use CommentTrait;

Add return $this->add_meta_comment( 'auto_preload_fonts', $html ); to the optimize method here