MU WPCOM: Port jetpack-global-styles from ETK

[okmttdhr]

Fixes https://github.com/Automattic/dotcom-forge/issues/8057

Proposed changes:

This PR ports jetpack-global-styles from ETK, as discussed in pbxlJb-5Xo-p2.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

• Patch this PR
• Activate one of themes in https://wordpress.com/themes/all/filter/editor-fonts (e.g., Leven)
• Go to page or post editor
  • Change font selection
  • Publish fonts
    
  • Observe fonts are applied on frontend
• Go to Appearance > Customize
  • Click "Fonts" section
  • Observe the links. ⚠️ Note that the first link is displayed only if your "Your homepage displays" is set to a static page.
    

[github-actions]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

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• ✅ Add a "[Status]" label (In Progress, Needs Team Review, ...).
  
• ✅ Add testing instructions.
  
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• ✅ Add changelog entries to affected projects
  

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[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the mu-wpcom/jetpack-global-styles branch.

  • For jetpack-mu-wpcom changes, also add define( 'JETPACK_MU_WPCOM_LOAD_VIA_BETA_PLUGIN', true ); to your wp-config.php file.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack mu-wpcom/jetpack-global-styles
  

  bin/jetpack-downloader test jetpack-mu-wpcom-plugin mu-wpcom/jetpack-global-styles
  

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[fushar]

Tested:

✅ Go to page or post editor, Change font selection, Publish fonts, Observe fonts are applied on frontend.
✅ Click "Fonts" section Observe the links.

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Tested on:

✅ Simple
✅ Atomic with ETK activated
✅ Atomic with ETK deactivated

[fushar]

Retested and still works nicely 👍