Use fsck to detect corrupt file systems in reproducers #14549

Job	Run time
aux	4m 38s
arch (presubmit_arch_linux)	10m 34s
arch (presubmit_arch_freebsd)	6m 34s
build	10m 3s
arch (presubmit_arch_netbsd)	4m 23s
arch (presubmit_arch_openbsd)	4m 15s
arch (presubmit_arch_darwin)	4m 18s
dashboard	3m 52s
race	8m 3s
arch (presubmit_arch_windows)	3m 24s
race_dashboard	4m 42s
arch (presubmit_arch_executor)	3m 12s
gvisor	4m 10s
old	6m 35s
	1h 18m 43s

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