Increase wait period in test for sagemaker resource

[jsitu777]

Increase wait perior to fix the error that some sagemaker resources are not ready

        model_reference, model_spec, model_resource = create_sagemaker_resource(
            resource_plural=cfg.MODEL_RESOURCE_PLURAL,
            resource_name=model_resource_name,
            spec_file="xgboost_model_with_model_location",
            replacements=replacements,
        )
>       assert model_resource is not None
E       AssertionError

[ananth102]

/lgtm

[ack-prow]

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