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.

GNOME/gnome-shell!1385
9 jobs for !1385 with launch-panel in 10 minutes and 47 seconds (queued for 2 seconds)
detached
Status Job ID Name Coverage
  Review
passed #835651
check_commit_log

00:01:59

passed #835653
eslint

00:01:41

passed #835652
js_check

00:02:08

passed #835655
no_template_check

00:00:29

passed #835654
potfile_check

00:02:02

 
  Build
passed #835656
build

00:07:40

passed #835657
flatpak
flatpak

00:01:55

 
  Test
passed #835658
test

00:00:54

passed #835659
test-pot

00:00:56