workflows: enable pr review with gemini cli #17593

Job	Run time
build	2m 1s
aux	1m 47s
dashboard	2m 0s
race_dashboard	1m 50s
race	1m 52s
arch (presubmit_arch_linux)	1m 43s
arch (presubmit_arch_darwin)	1m 47s
arch (presubmit_arch_netbsd)	1m 42s
arch (presubmit_arch_freebsd)	1m 49s
old	1m 53s
arch (presubmit_arch_openbsd)	1m 47s
arch (presubmit_arch_executor)	1m 48s
gvisor	1m 48s
arch (presubmit_arch_windows)	1m 47s
	25m 34s

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