Improve error when guest binary not found #142

Job	Run time
docs-pr	3s
build-on-linux (linux-kvm-debug)	53s
build-on-windows (windows-debug)	39s
build-on-linux (linux-kvm-release)	50s
build-on-windows (windows-release)	49s
build-on-linux (linux-hyperv-debug)	1m 0s
build-on-linux (linux-hyperv-release)	1m 5s
fuzzing / fuzz	9m 51s
rust / build (windows-2022-debug-amd)	14m 53s
rust / build (linux-kvm-debug-amd)	9m 49s
rust / build (linux-hyperv-debug-amd)	10m 4s
rust / build (windows-2022-release-amd)	18m 57s
rust / build (linux-kvm-release-amd)	13m 52s
rust / build (linux-hyperv-release-amd)	13m 49s
rust / build (windows-2022-debug-intel)	15m 6s
rust / build (linux-kvm-debug-intel)	8m 58s
rust / build (linux-hyperv-debug-intel)	9m 44s
rust / build (windows-2022-release-intel)	19m 54s
rust / build (linux-kvm-release-intel)	13m 38s
rust / build (linux-hyperv-release-intel)	13m 29s
	2h 57m 23s

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