Move wpcom/v2/publicize/connections endpoint to publicize package

[manzoorwanijk]

Fixes #

Proposed changes:

• Move wpcom/v2/publicize/connections endpoint to publicize package that can be used in every scenario the publicize module is used
  • WPCOM sites
  • Jetpack sites - both Jetpack and Social plugins

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:

• Apply this PR to your sandbox and point public API to the sandbox
• Goto Developer console
• Hit WP REST API - wpcom/v2/sites/<site_id>/publicize/connections
• Confirm that the site connections are displayed correctly as per the schema in this PR
• Break a connection by removing Jetpack from the service, e.g. here for Facebook.
• Add ?test_connections=1 to the endpoint above
• Verify that the tests are run for connections
• Verify that status is set to 'broken' for the broken connection
• Mark a connection as global in Calypso connections screen
• Verify that global is set to true for backwards compatibility
• Point your Jetpack site to the sandbox
• Goto any page which uses wp.apiFetch e.g. Block Editor
• In console, run this

await wp.apiFetch({
    path: '/wpcom/v2/publicize/connections'
});

• Confirm that the site connections are displayed correctly as per the schema in this PR

[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/move-wpcom/v2/publicize/connections-to-publicize branch.

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

  bin/jetpack-downloader test jetpack update/move-wpcom/v2/publicize/connections-to-publicize
  

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 a "[Status]" label (In Progress, Needs Team Review, ...).
  
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• ✅ 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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Jetpack plugin:

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

• WordPress.com Simple releases happen semi-continuously (PCYsg-Jjm-p2).
• WoA releases happen weekly.
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