docs/research.md: Remove duplicate entries #17050

Job	Run time
dashboard	2m 1s
aux	4m 29s
arch (presubmit_arch_openbsd)	3m 42s
arch (presubmit_arch_darwin)	3m 51s
arch (presubmit_arch_netbsd)	3m 49s
race_dashboard	3m 28s
race	7m 14s
arch (presubmit_arch_freebsd)	6m 7s
arch (presubmit_arch_executor)	3m 13s
build	4m 22s
old	6m 49s
gvisor	3m 48s
arch (presubmit_arch_linux)	10m 25s
arch (presubmit_arch_windows)	3m 35s
	1h 6m 53s

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