CI: Enable parallel mode for the coveralls #550

Job	Run time
e2e (v1.25.12, long-running-resume,from-volume-resume,median-stop)	14m 0s
e2e (v1.25.12, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	19m 15s
e2e (v1.25.12, file-metrics-collector,pytorchjob-mnist)	13m 57s
e2e (v1.25.12, median-stop-with-json-format,file-metrics-collector-with-json-format)	12m 23s
e2e (v1.26.6, long-running-resume,from-volume-resume,median-stop)	15m 57s
e2e (v1.26.6, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	20m 56s
e2e (v1.26.6, file-metrics-collector,pytorchjob-mnist)	17m 29s
e2e (v1.26.6, median-stop-with-json-format,file-metrics-collector-with-json-format)	22m 1s
e2e (v1.27.3, long-running-resume,from-volume-resume,median-stop)	18m 29s
e2e (v1.27.3, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	19m 9s
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)	13m 46s
	3h 20m 19s

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