Settings: Newsletter: Adding connection banner to each section

[grzegorz-cp]

Fixes https://github.com/Automattic/jetpack-marketing/issues/1021

Proposed changes:

• adding user connection banner to each section of the Newsletters Settings group

Updated panels:

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:

• Create a JN instance from this branch
• Connect the site but not the user
• Go to Settings/Newsletter and verify that each section has a banner informing about user connection
• Connect a user and verify that the banner is not visible

[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 update/settings-newsletter-1022-connection-banner branch.

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

  bin/jetpack-downloader test jetpack update/settings-newsletter-1022-connection-banner
  

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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[CodeyGuyDylan]

Other than the name of the feature constant, this all looks good to me. I think you can probably merge this after getting that changed as long as everything still works so I'll approve 😄

[CodeyGuyDylan]

LGTM

[CodeyGuyDylan]

I re-approved but you'll have to resolve some merge conflicts due to the PRs that I merged earlier. You can probably go ahead and merge once that's done 😄