improve the display of disabled downstream projects (#418)
improve the display of disabled downstream projects (#418)

It's currently hard to see which projects are disabled. We
can present this information clearer by using buildkite-agent annotate.
bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration