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c08776a5 - Refactor exception handling in torch._dynamo with raise_python_observed_exception (#178619)

Refactor exception handling in torch._dynamo with raise_python_observed_exception (#178619) Summary: Introduce a new convenience wrapper raise_python_observed_exception() that automatically converts Python string arguments to VariableTrackers. This reduces boilerplate and centralizes the pattern of wrapping string literals in exception arguments. Authored with Claude. X-link: https://github.com/pytorch/pytorch/pull/178619 Approved by: https://github.com/Lucaskabela Reviewed By: izaitsevfb Differential Revision: D98790070 fbshipit-source-id: 08dd97124d19d64416bf1da22d214f49c93e52e1 Co-authored-by: Claude Copilot <223556219+Copilot@users.noreply.github.com>