Newsletter settings: default featured image in email to true for new sites

[allilevine]

Fixes https://github.com/Automattic/loop/issues/605

Proposed changes:

• Defaults the featured image in email setting to true for new sites.

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

https://github.com/Automattic/loop/issues/605#issuecomment-2789741872

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

N/A

Testing instructions:

• Go to '..'

[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 WoA dev 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 (Jetpack), and enable the update/newsletter-featured-image-default-to-true branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack update/newsletter-featured-image-default-to-true

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:

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• ✅ Add testing instructions.
  
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• ✅ Add changelog entries to affected projects
  

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Follow this PR Review Process:

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[jp-launch-control]

Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

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