DBUS calls to Gnome Shell don't work in Tails 6

[BenWestgate]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Notice the notifications are not being cleared by the dbus commands anymore.

Expected behavior
I expect Bails to not put notifications on the lock screen that reveal what applications are running underneath. As well as to not waste memory storing hundreds of these.

Screenshots

Additional context
One option is to minimize the usage of notifications.

Another is to see if the notifications can be set to not show on the lock screen.

Another may be Do Not Disturb mode.

Dialogs could be launched to provide the same information.

[BenWestgate]

Removing this command for the time being as it has no effect anymore:
dbus-send --session --type=method_call --dest=org.gnome.Shell /org/gnome/Shell org.gnome.Shell.Eval string:'Main.panel.statusArea.dateMenu._messageList._sectionList.get_children().forEach(s => s.clear());

[BenWestgate]

DND mode is unlikely to be part of the solution as it stops non-urgent notifications from showing at all, but still caches them in the notification center.

We need the information given by the current notifications either moved to dialogs and/or reduced in frequency so that they're easy to manually clear.

Ideally, notifications would not be displayed by Bails in ordinary post-setup use except for urgent things so as to keep the lock screen tidy.

[BenWestgate]

Closed by #161 #44