Partially addressees #39858. Design is not final and will be iterated upon.
Changes proposed in this Pull Request
Add support for showing Jetpack Search product in /plans via a feature gate.
Testing instructions
Spin up this branch locally.
Navigate to /plans and select a Jetpack site without any plan subscriptions. You should see something like this at the bottom:
Navigate to /plans and select a Jetpack site with a plan that includes Jetpack Backups. You should see something like this:
Navigate to /plans in wp-calypso for a Jetpack site without any Jetpack plans. Alternatively, you can add a flags=-jetpack/search-product query string to the URL. You should see something like this:
Repeat step 4 for a Jetpack site with a Jetpack plan that includes Backups. It should look like this:
Unfortunately, no screenshots were provided by the developer.