Add back sys import.

[claudevdm]

Tests are failing https://github.com/apache/beam/actions/runs/19499862856/job/55811002383 because import was removed in #36732

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Summary of Changes

Hello @claudevdm, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on enhancing the compatibility of Apache Beam's type hint conversion utility with newer Python versions, specifically Python 3.10 and later. It introduces version-specific checks to correctly interpret and convert advanced type hint constructs like types.UnionType and typing.NewType, ensuring robust type handling across different Python environments.

Highlights

• Re-introduction of sys module import: The sys module has been re-imported into native_type_compatibility.py to facilitate version-specific checks.
• Python 3.10+ compatibility for types.UnionType: Conditional logic has been added to the convert_to_beam_type function to specifically handle types.UnionType only when running on Python 3.10 or newer, addressing potential compatibility issues with the pipe operator for unions.
• Python 3.10+ compatibility for typing.NewType: The handling of typing.NewType in convert_to_beam_type now includes a version check, applying specific logic only for Python 3.10 and above, where NewType changed from a function to a class.

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[claudevdm]

R: @jrmccluskey
R: @tvalentyn

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[jrmccluskey]

LGTM, not sure how that got taken out!

[Abacn]

Sounds strange though. This file no longer uses sys module, and the error stacktrace

 File "/runner/_work/beam/beam/sdks/python/apache_beam/typehints/native_type_compatibility.py", line 343, in convert_to_beam_type
    if sys.version_info >= (3, 12) and TypeAliasType is not None:

"native_type_compatibility" has imported sys.

yet lint does not complain

EDIT: sorry, never mind. I was confused.