fix: handle Pydantic BaseModel in _safe_json_serialize for telemetry#4723

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giulio-leone wants to merge 2 commits intogoogle:mainfrom

giulio-leone:fix/pydantic-telemetry-serialize-v2

Commits on Mar 5, 2026

fix: handle Pydantic BaseModel in _safe_json_serialize

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refactor: extract Pydantic serialization into shared utility

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