workflows: enable pr review with gemini cli #17592

Job	Run time
aux	2m 18s
race	2m 13s
race_dashboard	1s
dashboard	1s
build	1s
arch (presubmit_arch_linux)	2m 16s
arch (presubmit_arch_freebsd)	2m 17s
arch (presubmit_arch_openbsd)	2m 17s
gvisor	2m 18s
arch (presubmit_arch_executor)	2m 17s
arch (presubmit_arch_windows)	2m 16s
arch (presubmit_arch_netbsd)	2m 16s
arch (presubmit_arch_darwin)	2m 16s
old	2m 17s
	25m 4s

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