syz-cluster: initial code #14942

Job	Run time
dashboard	25s
build	27s
aux	1m 55s
arch (presubmit_arch_linux)	1m 53s
gvisor	1m 25s
arch (presubmit_arch_freebsd)	1m 54s
old	38s
race	25s
arch (presubmit_arch_netbsd)	1m 52s
arch (presubmit_arch_openbsd)	1m 54s
arch (presubmit_arch_darwin)	1m 50s
race_dashboard	23s
arch (presubmit_arch_windows)	1m 52s
arch (presubmit_arch_executor)	1m 54s
	18m 47s

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