liveusb-creator should prevent GNOME from managing the target device

liveusb-creator should probably inhibit udisks while working, e.g. to avoid spurious GNOME dialogs to appear and tell the user they can unplug their USB stick.

Parent Task: #8290 (closed)

Related issues

Related to #8331 (closed)
Related to #9280 (closed)

Original created by @tails on 5938 (Redmine)

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