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7e046ea8 - core: Cleanup Pydantic models and handle deprecation warnings (#30799)

core: Cleanup Pydantic models and handle deprecation warnings (#30799) * Simplified Pydantic handling since Pydantic v1 is not supported anymore. * Replace use of deprecated v1 methods by corresponding v2 methods. * Remove use of other deprecated methods. * Activate mypy errors on deprecated methods use. --------- Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>