workflows: enable pr review with gemini cli #17588

Job	Run time
race_dashboard	2m 20s
aux	2m 6s
dashboard	2m 19s
build	2m 19s
race	2m 18s
arch (presubmit_arch_linux)	2m 6s
arch (presubmit_arch_darwin)	2m 9s
arch (presubmit_arch_openbsd)	2m 10s
arch (presubmit_arch_freebsd)	2m 10s
arch (presubmit_arch_netbsd)	2m 10s
arch (presubmit_arch_windows)	2m 11s
gvisor	2m 7s
old	2m 9s
arch (presubmit_arch_executor)	2m 9s
	30m 43s

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