feat(sdk): Support multiple pip index URLs. #1473

Job	Run time
e2e (v1.29.2, long-running-resume,from-volume-resume,median-stop)	20m 11s
e2e (v1.29.2, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	26m 3s
e2e (v1.29.2, file-metrics-collector,pytorchjob-mnist)	15m 25s
e2e (v1.30.7, file-metrics-collector,pytorchjob-mnist)	18m 28s
e2e (v1.30.7, median-stop-with-json-format,file-metrics-collector-with-json-format)	24m 51s
e2e (v1.31.3, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	20m 15s
e2e (v1.29.2, median-stop-with-json-format,file-metrics-collector-with-json-format)	15m 38s
e2e (v1.29.2, hyperopt-distribution,optuna-distribution)	16m 22s
e2e (v1.30.7, hyperopt-distribution,optuna-distribution)	12m 48s
e2e (v1.31.3, long-running-resume,from-volume-resume,median-stop)	22m 52s
e2e (v1.30.7, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	24m 59s
e2e (v1.31.3, hyperopt-distribution,optuna-distribution)	18m 4s
e2e (v1.31.3, file-metrics-collector,pytorchjob-mnist)	23m 27s
e2e (v1.30.7, long-running-resume,from-volume-resume,median-stop)	20m 52s
e2e (v1.31.3, median-stop-with-json-format,file-metrics-collector-with-json-format)	14m 33s
	4h 54m 48s

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