fix: multiartifact support for JS #242

Job	Run time
collab-check	4s
wait-for-approval	3s
detect-changes	12s
codestyle-doc-tests (sagemaker-mlops)	5m 10s
codestyle-doc-tests (sagemaker-core)	28m 30s
unit-tests (sagemaker-serve)	43m 9s
codestyle-doc-tests (sagemaker-train)	6m 45s
codestyle-doc-tests (sagemaker-serve)	6m 29s
unit-tests (sagemaker-train)	30m 13s
integ-tests (sagemaker-train)	50m 11s
unit-tests (sagemaker-mlops)	28m 37s
unit-tests (sagemaker-core)	1h 4m 56s
integ-tests (sagemaker-mlops)	21m 23s
integ-tests (sagemaker-serve)	31m 14s
integ-tests (sagemaker-core)	23m 52s
	5h 40m 48s

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