Description of problem:

If the system isn't registered, a "System Not Registered" notification is shown, which includes a "Register System..." button.

When you click on "Register System...", the details panel of the Settings app is shown, with no visible UI related to subscription management. (Subscription management is included in this panel, but it's not visible - you have to scroll down to see it.)

This was confusing to me when I tried it. I assume that it will be confusing to other users too.

Version-Release number of selected component (if applicable):

gnome-control-center-40.0-16.el9.src.rpm

Steps to Reproduce:
1. Install RHEL 9, don't setup a subscription in the installer
2. Go through initial setup and start the first session
3. A "system not registered" notification pops up. Click on "register system..."

Expected results:

This is a slightly tricky issue to resolve. Ideally we'd maybe scroll the view in Settings down, and visually highlight the subscription status.

However, I suspect that it might be simpler to just open the register system dialog, if that's possible.

(Side note: I notice that the register system dialog isn't modal to the main Settings window...)