syz-cluster: skip fuzzing if binaries are the same #17590

Job	Run time
build	3m 12s
aux	4m 42s
dashboard	2m 29s
arch (presubmit_arch_netbsd)	3m 47s
race	7m 14s
arch (presubmit_arch_linux)	10m 37s
race_dashboard	3m 16s
arch (presubmit_arch_openbsd)	3m 39s
old	6m 59s
gvisor	3m 52s
arch (presubmit_arch_darwin)	3m 36s
arch (presubmit_arch_executor)	3m 18s
arch (presubmit_arch_freebsd)	6m 7s
arch (presubmit_arch_windows)	3m 26s
	1h 6m 14s

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