Model does not have a sagemaker_session property #5829

PySDK Version

• PySDK V2 (2.x)
• [ X] PySDK V3 (3.x)

Describe the bug
A clear and concise description of what the bug is.

ModelStep expects the Model class to have a sagemaker_session attribute but the spec does not allow it

To reproduce

Provide a Model instance as the model argument of the register model step arguments

Expected behavior
ModelStep can be instantiated with a repack step

Screenshots or logs
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System information
A description of your system. Please provide:

• SageMaker Python SDK version: 3
• Framework name (eg. PyTorch) or algorithm (eg. KMeans): SKLearn
• Framework version: 1.4.2
• Python version: 3.11
• CPU or GPU: CPU
• Custom Docker image (Y/N): N

Additional context
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