DO NOT MERGE: removing timestamp validation in FnApiDoFnRunner

[kennknowles]

Attempting to reproduce a remembered test failure from https://github.com/apache/beam/pull/34902/files#r2528479326

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[gemini-code-assist]

Summary of Changes

Hello @kennknowles, 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 introduces an experimental change, explicitly marked 'DO NOT MERGE', aimed at reproducing or investigating a specific test failure. It temporarily disables timestamp validation in the FnApiDoFnRunner component to observe its effect on a previously encountered issue.

Highlights

• Timestamp Validation Disabled: The checkTimestamp method call within the FnApiDoFnRunner has been commented out, effectively disabling timestamp validation for windowedValue outputs. This change is explicitly marked as 'DO NOT MERGE' and is for experimental purposes.

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