3.18 - CDN compatibility part

[piotrbak]

User Story As a user with the CDN option, I want locally stored Google Fonts and CSS files to be loaded from the CDN

Acceptance Criteria

1. The feature will rewrite paths to the CSS files to the CDN paths
2. The feature will rewrite paths to the fonts to the CDN paths
3. The feature will rewrite paths to the fonts to the CDN paths when the CSS method will be set to be internal one with the filter

[jeawhanlee]

Scope a solution ✅

The feature will rewrite paths to the CSS files to the CDN paths

• We are already doing this for local urls, so it will automatically apply. We might need to adjust the priorities on rocket_buffer

  The feature will rewrite paths to the fonts to the CDN paths

• On this line from the draft PR Check if cdn is enabled and rewrite local url to use the cname.

Estimate the effort ✅ [XS]

[Miraeld]

Looks good to me.

[remyperona]

A simple solution to handle the CDN rewrite in the CSS path without having to have the CDN class as a dependency is to use a filter on the URL, and add a hook on it in the CDN Subscriber