Use ErrorList for experiment validator #601

Job	Run time
e2e (v1.27.11, long-running-resume,from-volume-resume,median-stop)	16m 17s
e2e (v1.27.11, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	51m 13s
e2e (v1.27.11, file-metrics-collector,pytorchjob-mnist)	17m 44s
e2e (v1.27.11, median-stop-with-json-format,file-metrics-collector-with-json-format)	13m 58s
e2e (v1.28.7, long-running-resume,from-volume-resume,median-stop)	19m 17s
e2e (v1.28.7, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	50m 20s
e2e (v1.28.7, file-metrics-collector,pytorchjob-mnist)	12m 28s
e2e (v1.28.7, median-stop-with-json-format,file-metrics-collector-with-json-format)	20m 25s
e2e (v1.29.2, long-running-resume,from-volume-resume,median-stop)	15m 25s
e2e (v1.29.2, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	50m 14s
e2e (v1.29.2, file-metrics-collector,pytorchjob-mnist)	12m 35s
e2e (v1.29.2, median-stop-with-json-format,file-metrics-collector-with-json-format)	12m 59s
	4h 52m 55s

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