pkg/report: improve "Bad page state" parsing #14408

Job	Run time
aux	4m 39s
build	9m 25s
dashboard	3m 55s
arch (presubmit_arch_linux)	10m 36s
arch (presubmit_arch_freebsd)	6m 26s
gvisor	4m 4s
arch (presubmit_arch_netbsd)	4m 17s
arch (presubmit_arch_openbsd)	4m 14s
old	6m 28s
arch (presubmit_arch_darwin)	4m 18s
race	6m 19s
arch (presubmit_arch_windows)	3m 23s
race_dashboard	4m 13s
arch (presubmit_arch_executor)	3m 19s
	1h 15m 36s

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