NameError: name 'session' is not defined

[benieric]

Describe the bug
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Some places in sagemaker-core do not define session in the methods resulting in NameError: name 'session' is not defined

To reproduce
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The provided code need to be complete and runnable, if additional data is needed, please include them in the issue.

from sagemaker_core.resources import Hub, HubContentReference

    hub = Hub.create(
        hub_name="CompanyHub",
        hub_description="These are allowlisted models taken from the JumpStart Public Hub.",
        hub_display_name="Allowlisted Models",
    )


hub_content_reference = HubContentReference.create(
    hub_name=hub.hub_name,
    sage_maker_public_hub_content_arn="arn:aws:sagemaker:us-west-2:aws:hub-content/SageMakerPublicHub/Model/deepseek-llm-r1-distill-qwen-7b",
    hub_content_name="deepseek-llm-r1-distill-qwen-7b",
)

Expected behavior
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There should not be a failure

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Bug information
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• SageMaker Core version:
• Python version:
• Is the issue with autogen code or with generate code ?:

Additional context
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