Improve error when guest binary not found #137

Job	Run time
docs-pr	4s
build-on-windows (windows-debug)	39s
build-on-linux (linux-kvm-debug)	1m 4s
build-on-windows (windows-release)	49s
build-on-linux (linux-kvm-release)	53s
build-on-linux (linux-hyperv-debug)	57s
build-on-linux (linux-hyperv-release)	56s
fuzzing / fuzz	10m 11s
rust / build (windows-2022-debug-amd)	5m 52s
rust / build (linux-kvm-debug-amd)	5m 21s
rust / build (linux-hyperv-debug-amd)	2m 23s
rust / build (windows-2022-release-amd)	5m 47s
rust / build (linux-kvm-release-amd)	5m 7s
rust / build (linux-hyperv-release-amd)	1m 40s
rust / build (windows-2022-debug-intel)	5m 59s
rust / build (linux-kvm-debug-intel)	6m 13s
rust / build (linux-hyperv-debug-intel)	6m 48s
rust / build (windows-2022-release-intel)	5m 58s
rust / build (linux-kvm-release-intel)	5m 55s
rust / build (linux-hyperv-release-intel)	6m 56s
	1h 19m 32s

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