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* Fixes to test_onnx_export when saving input and output tensors

- Allow saving i/o tensors when onnxruntime inference is skipped
- Support saving multiple outputs
Signed-off-by: Gal Hubara Agam <ghubaraagam@nvidia.com>

* fix
Signed-off-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>

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Signed-off-by: Gal Hubara Agam <ghubaraagam@nvidia.com>
Signed-off-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>
Co-authored-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>