Test suite: make installing old version of Tails quicker (refs: #16004).
It's way quicker to copy the old version of Tails using its USB image instead of starting it from DVD and cloning to USB. Use the implementation of the usb-install-tails-greeter checkpoint, with a few variations (old Tails USB image, and different device name). Also, instead of removing the USB device at the end, trigger a proper shutdown of the computer (the emergency shutdown would be triggered anyway).
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