Fix: Update s3 data type for fine-tuning jobs to support s3 uri #248

Job	Run time
collab-check	5s
wait-for-approval	2s
detect-changes	12s
unit-tests (sagemaker-mlops)	28m 4s
integ-tests (sagemaker-mlops)	21m 21s
integ-tests (sagemaker-train)	51m 59s
unit-tests (sagemaker-train)	28m 54s
codestyle-doc-tests (sagemaker-serve)	6m 44s
integ-tests (sagemaker-serve)	31m 38s
codestyle-doc-tests (sagemaker-train)	6m 16s
unit-tests (sagemaker-serve)	43m 8s
codestyle-doc-tests (sagemaker-mlops)	5m 42s
	3h 44m 5s

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