As outlined earlier, in order to turn the Extensions app into a properly
sandboxed application, we need to split out the extension prefs dialog
and move it elsewhere.
With "elsewhere" being the new Extensions D-Bus service, effectively
turning it into a shell extensions portal.
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1106
The dialog that contains the extension's preference widget has become
fairly complex over time, mostly due to the error handling.
It therefore makes sense to move it to a template, just like we did
for the main application window and extension rows.
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1106
Using the "regular" loadInterfaceXML() helper means less code duplication,
but it also ties us to the resource used by gnome-shell.
In order to untangle the extension app from core gnome-shell, change that
to load the interface from the existing data resource instead. While that
does involve reimplementing loadInterfaceXML(), it's not too bad actually
with the resource-loading code stripped (as the data resource is already
loaded by the package module).
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1081
