Fix incorrect usage of publicize config in subscribe block

[manzoorwanijk]

Fixes #40354

I had previously warned about a potential issue with the Subscribe block's incorrect usage of Publicize module config, but I think it wasn’t fixed.

Now, we received reports of that block crashing when it's edited in FSE.

Proposed changes:

• Use useModuleStatus hook instead of usePublicizeConfig to check the publicize module status in subscribe block controls

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:

• Goto Jetpack Settings
• Enable Newsletter
• Goto Site editor
• Add the Subscribe widget
• Confirm that there is no error
• Confirm that the block settings work as expected when Publicize is turned ON/OFF

[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 fix/incorrect-usage-of-publicize-in-subscribe-block branch.

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

  bin/jetpack-downloader test jetpack fix/incorrect-usage-of-publicize-in-subscribe-block
  

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!

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[simison]

Untested by me but code change looks good. Thanks for including test!