Jetpack Google Fonts: Filters out deprecated font provider when reading the theme's theme.json.

[fushar]

Related to:

• Create Block Theme plugin - Fonts stopped working on child theme wp-calypso#85036

Proposed changes:

This is a continuation to #34306. Here, the deprecated font provider might have been still present in the site's global styles. When a user exported the theme from such sites, the resulting theme.json in the zip file will contain the deprecated font provider. This PR filters out such provider when reading the theme's theme.json as well.

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:

1. Prepare a WoA site.
2. Install this theme: test-theme.zip, which contains the deprecated font provider.
3. Go to the frontend; verify that the text body shows a broken serif font (instead of Jost).
4. Apply this PR to the site via instructions below provided by the bot.
5. Go to the frontend again; verify that the text body now correctly uses Jost.

[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 google-font-remove-dirty-on-theme-json branch.

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

  bin/jetpack-downloader test jetpack google-font-remove-dirty-on-theme-json
  

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

[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:

• ✅ Include a description of your PR changes.
  
• ✅ Add a "[Status]" label (In Progress, Needs Team Review, ...).
  
• ✅ Add testing instructions.
  
• ✅ Specify whether this PR includes any changes to data or privacy.
  
• ✅ Add changelog entries to affected projects
  

This comment will be updated as you work on your PR and make changes. If you think that some of those checks are not needed for your PR, please explain why you think so. Thanks for cooperation 🤖

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The e2e test report can be found here. Please note that it can take a few minutes after the e2e tests checks are complete for the report to be available.

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Once your PR is ready for review, check one last time that all required checks appearing at the bottom of this PR are passing or skipped.
Then, add the "[Status] Needs Team Review" label and ask someone from your team review the code. Once reviewed, it can then be merged.
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Jetpack plugin:

The Jetpack plugin has different release cadences depending on the platform:

• WordPress.com Simple releases happen daily.
• WoA releases happen weekly.
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[taipeicoder]

Works as intended 👍

Before	After

[arthur791004]

Tested and it works as expected 👍