fwupd fake test device doesn't work in `Firmware Updater`

In fwupd 1.9.14 in noble there is a new feature to very easily enable a test device for testing firmware upgrade flows without real hardware.

Install like this:

sudo apt install fwupd-tests
sudo fwupdtool enable-test-devices
sudo systemctl restart fwupd

After that a fake "Integrated Webcam" will show up that can be updated natively.

It works using fwupdmgr: Screenshot from 2024-02-29 14-06-06

It fails using firmware updater. Screenshot from 2024-02-29 12-21-52

Versions:

$ apt policy fwupd-tests
fwupd-tests:
  Installed: 1.9.14-1
  Candidate: 1.9.14-1
  Version table:
 *** 1.9.14-1 500
        500 http://us.archive.ubuntu.com/ubuntu noble/universe amd64 Packages
        100 /var/lib/dpkg/status
$ apt policy fwupd
fwupd:
  Installed: 1.9.14-1
  Candidate: 1.9.14-1
  Version table:
 *** 1.9.14-1 500
        500 http://us.archive.ubuntu.com/ubuntu noble/main amd64 Packages
        100 /var/lib/dpkg/status
$ snap info firmware-updater
name:      firmware-updater
summary:   Firmware Updater
publisher: Canonical✓
store-url: https://snapcraft.io/firmware-updater
contact:   https://github.com/canonical/firmware-updater/
license:   GPL-3.0+
description: |
  Update Firmware
commands:
  - firmware-updater
services:
  firmware-updater.firmware-notifier:    simple, enabled, inactive
  firmware-updater.firmware-updater-app: dbus, enabled, inactive
snap-id:      EI0D1KHjP8XiwMZKqSjuh6W8zvcowUVP
tracking:     latest/stable/ubuntu-24.04
refresh-date: 3 days ago, at 14:56 CST
channels:
  latest/stable:    0+git.90251bb 2024-02-20 (121) 11MB -
  latest/candidate: 0+git.90251bb 2024-02-02 (121) 11MB -
  latest/beta:      ↑
  latest/edge:      0+git.019bf66 2023-07-17 (105) 11MB -
installed:          0+git.90251bb            (121) 11MB -

canonical / firmware-updater

fwupd fake test device doesn't work in `Firmware Updater` #264