Social | Use the proxy trait from connection package

[manzoorwanijk]

Now that we have the WPCOM_REST_API_Proxy_Request trait in trunk following #41023, we can use it to remove the copied code

Proposed changes:

• Use the WPCOM_REST_API_Proxy_Request trait from connection package
• Remove the copied code

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:

• Go to connections management
• Verify that the connections load fine for both admin and author
• Verify connection test results

[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/social-use-the-proxy-trait-from-connection-package branch.

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

  bin/jetpack-downloader test jetpack update/social-use-the-proxy-trait-from-connection-package
  

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• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
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• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

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