Make test fields private in Go unit tests #573

Job	Run time
e2e (v1.27.11, long-running-resume,from-volume-resume,median-stop)	14m 52s
e2e (v1.27.11, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	22m 16s
e2e (v1.27.11, file-metrics-collector,pytorchjob-mnist)	14m 0s
e2e (v1.27.11, median-stop-with-json-format,file-metrics-collector-with-json-format)	13m 16s
e2e (v1.28.7, long-running-resume,from-volume-resume,median-stop)	15m 7s
e2e (v1.28.7, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	18m 58s
e2e (v1.28.7, file-metrics-collector,pytorchjob-mnist)	18m 44s
e2e (v1.28.7, median-stop-with-json-format,file-metrics-collector-with-json-format)	15m 32s
e2e (v1.29.2, long-running-resume,from-volume-resume,median-stop)	15m 48s
e2e (v1.29.2, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	20m 53s
e2e (v1.29.2, file-metrics-collector,pytorchjob-mnist)	13m 19s
e2e (v1.29.2, median-stop-with-json-format,file-metrics-collector-with-json-format)	13m 43s
	3h 16m 28s

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