Use ErrorList for experiment validator #1385

Job	Run time
Publish Image (file-metrics-collector, cmd/metricscollector/v1beta1/file-metricscollector/Dockerf... / Publish Image	7m 50s
Publish Image (katib-controller, cmd/katib-controller/v1beta1/Dockerfile) / Publish Image	14m 21s
Publish Image (katib-db-manager, cmd/db-manager/v1beta1/Dockerfile) / Publish Image	5m 54s
Publish Image (katib-ui, cmd/ui/v1beta1/Dockerfile) / Publish Image	45m 56s
Publish Image (tfevent-metrics-collector, cmd/metricscollector/v1beta1/tfevent-metricscollector/D... / Publish Image	6m 31s
	1h 20m 32s

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