fix: validate attribute assignment with pydantic

[benieric]

Issue #, if available: https://github.com/aws/sagemaker-core/issues/23

Description of changes:

• Pydantic was not validating on assignment. As a result, when editing an attribute value during refresh() flow an attribute assignment would not be validated and not converting dicts to model object. More details in linked issue.

  • (ie, mode_artifacts is a ModelArtifact, when editing this attribute in refresh() flow pydantic would not convert dict to ModelArtifact and just directly assign as dict because validation was not occuring

• Fix by adding validate_assignment flag

  model_config = ConfigDict(protected_namespaces=(), validate_assignment=True)

• Also update notebook

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