Remove 3.9-specific branches in typehinting module

[jrmccluskey]

Simplifies some code in the Python SDK's typehinting module by removing branching based on Python version that is now always true.

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Summary of Changes

Hello @jrmccluskey, 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 refactors the Python SDK's typehinting module by removing conditional logic that was previously used to differentiate behavior based on Python versions prior to 3.10. By standardizing on Python 3.10+ specific features like types.UnionType and instruction offset handling, the codebase becomes simpler and more maintainable, reflecting the current minimum supported Python versions.

Highlights

• Simplified Type Union Handling: Removed sys.version_info checks when handling types.UnionType and typing.NewType in native_type_compatibility.py and typehints.py, streamlining the code as these behaviors are now standard for supported Python versions.
• Unified Jump Multiplier Logic: Eliminated the Python version conditional for jump_multiplier in trivial_inference.py, standardizing on the Python 3.10+ instruction offset logic.
• Streamlined Test Execution: Removed the sys.version_info guard from test_pipe_operator_as_union in typehints_test.py, ensuring the test runs unconditionally, reflecting the baseline Python version support.

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[github-actions]

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R: @liferoad for label python.

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[github-actions]

Reminder, please take a look at this pr: @liferoad

[github-actions]

Assigning new set of reviewers because Pr has gone too long without review. If you would like to opt out of this review, comment assign to next reviewer:

R: @tvalentyn for label python.

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