Fix/error when non admin user disconnects site

[CodeyGuyDylan]

Proposed changes:

• Update Connection package to allow user disconnection even when user is non-admin
• Update the disconnect_site function to disconnect the user account if the user does not have the permissions to disconnect the site connection

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

Issue: #34535

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

No

Testing instructions:

1. Checkout this branch via the Jetpack Beta plugin or your local dev environment
2. Go to /wp-admin/admin.php?page=my-jetpack and connect the site and your user account
3. Go to /wp-admin/user-new.php and add a new user to the site
4. In an incognito browser, login to the site with the new user.
5. Go to /wp-admin/admin.php?page=my-jetpack and connect your user account under a different wordpress account
6. After connection, go back to /wp-admin/admin.php?page=my-jetpack and disconnect your site by clicking Manage and Disconnect Jetpack
   
   
7. Ensure your user account is disconnected with no errors
   

[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/error-when-non-admin-user-disconnects-site branch.

  • For jetpack-mu-wpcom changes, also add define( 'JETPACK_MU_WPCOM_LOAD_VIA_BETA_PLUGIN', true ); to your wp-config.php file.

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

  bin/jetpack-downloader test jetpack fix/error-when-non-admin-user-disconnects-site
  

  bin/jetpack-downloader test jetpack-mu-wpcom-plugin fix/error-when-non-admin-user-disconnects-site
  

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:

• ✅ Include a description of your PR changes.
  
• 🔴 Add a "[Status]" label (In Progress, Needs Team Review, ...).
  
• ✅ 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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Follow this PR Review Process:

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     • For most changes, including minor cross-team impacts.
     • Example: Updating a team-specific component or a small change to a shared library.
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