#7079416 Add post-connection prompt for users who have available user licenses

Changes proposed in this Pull Request

• Implement a dialog/modal to be shown to users who just connected their site, or visited the pricing page from a site’s WP Admin, and have at least one available license.

Testing instructions

Things to keep in mind while reviewing

• Try to test everything on both desktop and mobile.
• Compare the actual implementing to our Figma design: ceKxiVna5wfpmwFBsojrAx-fi-2804%3A32472

Setup

• Download this PR.
• Start both Calypsos with yarn start and yarn start-jetpack-cloud-p (run the last one after the first one is started).
• Go to https://cloud.jetpack.com/pricing.
• Purchase any Jetpack product other than Jetpack Search, and do not activate the product on any site.

Post-connection flow

• Create a JN site.
• Initiate the Jetpack setup process.
• Once you’re on WordPress.com, replace https://wordpress.com with http://calypso.localhost:3000, and maintain the rest of the URL intact.
• Authorize the connection.
• Verify that after connecting your site, you’re redirected to http://calypso.localhost:3000/jetpack/connect/plans/:site.
• Verify that you see a modal/dialog that tells you that you have an available license (if you have only one license available, you should see the name of the product; otherwise, no product name should be displayed. You can find your licenses in Store Admin).
  
• Open the Network tab, and enter calypso_user_license_ in the search box.
• Verify that you see a request that tracks the calypso_user_license_modal_view event (you might need to refresh the page).
• Click on the Select another product button.
• Verify that the dialog is closed and an event with the name calypso_user_license_modal_continue_click is dispatched.
• Refresh the page.
• Click on the Activate it now button.
• Verify that you are redirected to the My Plan section in WP Admin.
• Verify that you see a request that tracks the calypso_user_license_modal_activate_click event.

Plans tab flow

• On WP Admin, click on the Plans tab.
• Verify that you are redirected to https://cloud.jetpack.com/pricing/:site.
• Replace https://cloud.jetpack.com with http://jetpack.cloud.localhost:3001.
• Verify that you see the modal/dialog again.
  
• Open the Network tab, and enter calypso_user_license_ in the search box.
• Verify that you see a request that tracks the calypso_user_license_modal_view event (you might need to refresh the page).
• Click on the Select another product button.
• Verify that the dialog is closed and an event with the name calypso_user_license_modal_continue_click is dispatched.
• Refresh the page.
• Click on the Activate it now button.
• Verify that you are redirected to the My Plan section in WP Admin.
• Verify that you see a request that tracks the calypso_user_license_modal_activate_click event.

Verify no regression is introduced

• Visit http://jetpack.cloud.localhost:3001/pricing.
• Verify that you don’t see the modal/dialog.
• Visit http://calypso.localhost:3000/plans/:site.
• Verify that you don’t see the modal/dialog.

Related to 1201509629272450-as-1201545797263874