status/network: Use D-Bus to launch Settings panels

status/network: Use D-Bus to launch Settings panels

For more obscure network configurations, we need to launch the
corresponding Settings panel with additional parameters, so we
cannot simply launch the .desktop file.

However we can do better than spawning a command line: Control center
exposes an application action we can use instead, so the process is
launched with the appropriate activation environment and startup
notification support.

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1385