printers: Improved empty state of printer panel
requested to merge henne90gen/gnome-control-center:henne90gen/improve-printer-panel-empty-state into main
The empty state of the printer panel is not consistent with other panels of the GNOME Settings app. There are two empty states, either the system cannot connect to the printer service or there are no printers registered yet.
To fix this issue, AdwStatusPage has been introduced for both cases, which takes care of the layout and reduces the amount of code needed to create these two pages. With this change, both empty states of the printer panel have the same look as other panels in their empty state.
Closes #2141 (closed)
