Changes proposed in this Pull Request
This PR adds a plan upsell banner that explains new domains on a free site will redirect to the free subdomain.
Testing instructions
For a site without a plan, go to Manage -> Domains, and then click on the ‘Add a domain to this site’ button.
You should see this banner above the results:
Verify that clicking the Upgrade button sends you to the checkout page with a Personal plan added to cart.
Also check that events are sent properly
Finally, make sure this banner won’t show for sites with a plan, or for users that are exempt from PWPO
Unfortunately, no screenshots were provided by the developer.