[WIP] add unit tests for katib sdk #560

Job	Run time
e2e (v1.25.12, long-running-resume,from-volume-resume,median-stop)	14m 39s
e2e (v1.25.12, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	19m 40s
e2e (v1.25.12, file-metrics-collector,pytorchjob-mnist)	13m 28s
e2e (v1.25.12, median-stop-with-json-format,file-metrics-collector-with-json-format)	11m 33s
e2e (v1.26.6, long-running-resume,from-volume-resume,median-stop)	15m 28s
e2e (v1.26.6, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	19m 5s
e2e (v1.26.6, file-metrics-collector,pytorchjob-mnist)	12m 25s
e2e (v1.26.6, median-stop-with-json-format,file-metrics-collector-with-json-format)	13m 50s
e2e (v1.27.3, long-running-resume,from-volume-resume,median-stop)	7m 45s
e2e (v1.27.3, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	19m 39s
e2e (v1.27.3, file-metrics-collector,pytorchjob-mnist)	12m 57s
e2e (v1.27.3, median-stop-with-json-format,file-metrics-collector-with-json-format)	14m 31s
	2h 55m 0s

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