dashboard/app: install opsagent to batch processors #16121

Job	Run time
build	3m 19s
aux	5m 10s
race	7m 24s
race_dashboard	2m 45s
arch (presubmit_arch_openbsd)	3m 41s
arch (presubmit_arch_linux)	10m 4s
dashboard	2m 11s
arch (presubmit_arch_darwin)	3m 41s
arch (presubmit_arch_netbsd)	3m 55s
arch (presubmit_arch_freebsd)	6m 14s
arch (presubmit_arch_windows)	3m 32s
arch (presubmit_arch_executor)	3m 20s
old	6m 51s
gvisor	3m 37s
	1h 5m 44s

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