Setup Wizard doesn't fire when plugin activated from Plugins > Add New

[brianhogg]

Reproduction Steps

1. Go to Plugins > Add New, and search for LifterLMS
2. Activate plugin
3. Navigate away or refresh the page

Expected Behavior

Shows the setup wizard

Actual Behavior

Setup wizard not shown, LifterLMS can't be used without manual steps or finding the tool to trigger

We could either redirect to the wizard once when the user navigates away, and/or show a prompt on LifterLMS screens when something (ie. checkout page) is not correctly configured.

This issue has be recreated:

• [x] Locally
• [x] On a staging site
• [x] On a production website
• [x] With only LifterLMS and a default theme

[brianhogg]

In general this doesn't work the same because of the AJAX-ifying of the plugin activation process since WP 6.5, but the fix to switch from a transient to an option should at least reliably show the wizard on the next page load.