Re-enable Ubuntu Pro from the Jammy branch.

Nathan Teodosiorequested to merge
nteodosio/gnome-initial-setup:port-pro-gtk4 into ubuntu/latest

For that a port to GTK4 was needed.

To test the subject of this merge request, it is necessary to delete the check to is_ubuntu_pro_supported or to fool it by appending LTS to the VERSION in /etc/os-release, i.e.

VERSION="24.04 (Noble Numbat) LTS"
Edited by Nathan Teodosio

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