js: Use async D-Bus wrappers

js: Use async D-Bus wrappers

After porting the more complex cases - in particular those that
affect a module's API - we are left with straight-forward D-Bus
method calls that can be moved to promise-based wrappers in one
go.

For consistency, this also switches from Remote to Async where
the call result is ignored.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2344>