syz-agent: add git cookie authdaemon #20449

Job	Run time
race_dashboard	5m 2s
aux	5m 4s
old	7m 28s
dashboard	4m 22s
build	5m 47s
gvisor	4m 18s
arch (presubmit_arch_freebsd)	6m 59s
arch (presubmit_arch_linux)	11m 46s
arch (presubmit_arch_windows)	4m 0s
race	10m 7s
arch (presubmit_arch_openbsd)	4m 16s
arch (presubmit_arch_executor)	3m 11s
arch (presubmit_arch_darwin)	4m 3s
arch (presubmit_arch_netbsd)	4m 15s
	1h 20m 38s

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