workflows: enable pr review with gemini cli #17599

Job	Run time
race	8m 55s
build	4m 7s
aux	4m 29s
dashboard	2m 4s
arch (presubmit_arch_freebsd)	6m 23s
arch (presubmit_arch_darwin)	3m 42s
arch (presubmit_arch_linux)	10m 19s
arch (presubmit_arch_executor)	3m 16s
arch (presubmit_arch_netbsd)	3m 47s
arch (presubmit_arch_windows)	3m 28s
old	6m 54s
arch (presubmit_arch_openbsd)	3m 41s
gvisor	3m 48s
race_dashboard	3m 55s
	1h 8m 48s

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