Newsletter: Fix spacing for manage subscribers link

[arcangelini]

Summary

The link for "Manage all subscribers" was not looking great at the bottom of the options. It was a little too close to the text above and generally looked awkward between the option and link in the CardFooter. I tested a few options like extra margin or a divider to match the link below. In the end the best fix was to move this to the footer alongside the "Privacy information" link.

	Simple	Jetpack
Before
After

Follows up on #47565.

Testing instructions

• Go to wp-admin/admin.php?page=jetpack-newsletter
• Enable the subscriptions toggle
• Verify the "Manage all subscribers" looks good
• Toggle subscriptions off — verify the link disappears cleanly with no layout shift

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

No

[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 or WordPress.com Site Helper), and enable the fix/subscriber-toggle-spacing branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack fix/subscriber-toggle-spacing

bin/jetpack-downloader test jetpack-mu-wpcom-plugin fix/subscriber-toggle-spacing

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]

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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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