Add GUI-hosted CLI and IPC automation surface #42

Job	Run time
cli-headless-e2e (ubuntu-latest, UniGetUI.Avalonia.slnx, UniGetUI.Avalonia/UniGetUI.Avalonia.cspr...	3m 8s
cli-headless-e2e (windows-latest, UniGetUI.Windows.slnx, UniGetUI/UniGetUI.csproj, -p:Platform=x6...	9m 7s
	12m 15s

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