Improve error when guest binary not found #140

Job	Run time
docs-pr	4s
build-on-windows (windows-debug)	47s
build-on-linux (linux-kvm-debug)	59s
build-on-windows (windows-release)	49s
build-on-linux (linux-kvm-release)	49s
build-on-linux (linux-hyperv-debug)	1m 35s
build-on-linux (linux-hyperv-release)	1m 1s
fuzzing / fuzz	10m 4s
rust / build (windows-2022-debug-amd)	6m 58s
rust / build (linux-kvm-debug-amd)	5m 15s
rust / build (linux-hyperv-debug-amd)	7m 4s
rust / build (windows-2022-release-amd)	6m 52s
rust / build (linux-kvm-release-amd)	4m 52s
rust / build (linux-hyperv-release-amd)	6m 54s
rust / build (windows-2022-debug-intel)	7m 0s
rust / build (linux-kvm-debug-intel)	6m 10s
rust / build (linux-hyperv-debug-intel)	6m 53s
rust / build (windows-2022-release-intel)	6m 54s
rust / build (linux-kvm-release-intel)	6m 2s
rust / build (linux-hyperv-release-intel)	7m 3s
	1h 34m 5s

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