minor ci.syzbot.org improvements #18444

Job	Run time
aux	4m 30s
race	9m 5s
build	4m 20s
race_dashboard	3m 15s
arch (presubmit_arch_linux)	10m 51s
gvisor	4m 3s
arch (presubmit_arch_executor)	3m 29s
old	7m 23s
dashboard	3m 3s
arch (presubmit_arch_openbsd)	3m 49s
arch (presubmit_arch_freebsd)	6m 24s
arch (presubmit_arch_windows)	3m 47s
arch (presubmit_arch_darwin)	3m 48s
arch (presubmit_arch_netbsd)	3m 54s
	1h 11m 41s

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