dashboard/app: add targeting controls to the coverage page #15018

Job	Run time
aux	4m 47s
aux	4m 47s
build	13m 30s
build	13m 30s
arch (presubmit_arch_linux)	10m 53s
arch (presubmit_arch_linux)	10m 53s
dashboard	2m 57s
dashboard	2m 57s
arch (presubmit_arch_freebsd)	6m 36s
arch (presubmit_arch_freebsd)	6m 36s
arch (presubmit_arch_netbsd)	4m 27s
arch (presubmit_arch_netbsd)	4m 27s
race	8m 34s
race	7m 38s
arch (presubmit_arch_openbsd)	4m 22s
arch (presubmit_arch_openbsd)	4m 22s
arch (presubmit_arch_darwin)	4m 24s
arch (presubmit_arch_darwin)	4m 24s
arch (presubmit_arch_windows)	3m 24s
arch (presubmit_arch_windows)	3m 24s
arch (presubmit_arch_executor)	3m 17s
arch (presubmit_arch_executor)	3m 17s
gvisor	4m 9s
gvisor	4m 9s
old	6m 33s
old	6m 33s
race_dashboard	5m 6s
race_dashboard	5m 6s
	2h 45m 2s

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