Allow yield and return in the same 'process' if return doesn't have a value

[tvalentyn]

follow up for #25743

[tvalentyn]

R: @shunping

[gemini-code-assist]

Summary of Changes

Hello @tvalentyn, 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 refines the validation rules for DoFn process methods within the Apache Beam Python SDK. It addresses a previous limitation where process methods containing both yield and a return statement (even one used for early exit without a value) were incorrectly flagged. The changes now correctly permit return statements that do not provide a value to be used alongside yield, thereby offering greater flexibility for developers in structuring their DoFn logic.

Highlights

• Relaxed DoFn Validation: The validation logic for DoFn process methods has been updated to allow return statements without an explicit value (e.g., return for early exit) to coexist with yield statements. Previously, this combination would trigger an error.
• New Test Case: A new test TestDoFn0 has been introduced to specifically validate the updated behavior, ensuring that DoFn implementations using both yield and valueless return statements function as expected without raising errors.

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