dashboard/app: add manual AI job triage #18759

Job	Run time
old	7m 9s
race	8m 6s
gvisor	4m 4s
dashboard	3m 32s
build	3m 54s
arch (presubmit_arch_darwin)	3m 52s
aux	3m 38s
arch (presubmit_arch_freebsd)	6m 31s
arch (presubmit_arch_linux)	11m 11s
race_dashboard	4m 21s
arch (presubmit_arch_netbsd)	3m 55s
arch (presubmit_arch_openbsd)	3m 51s
arch (presubmit_arch_windows)	3m 41s
arch (presubmit_arch_executor)	3m 21s
	1h 11m 6s

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