[Dataflow Streaming] Avoid creating Duration objects in hot path

[arunpandianp]

#33578

[arunpandianp]

R: @scwhittle

[gemini-code-assist]

Summary of Changes

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This pull request focuses on a micro-optimization within the Dataflow streaming worker to enhance efficiency. By modifying how elapsed time is calculated, it eliminates the unnecessary instantiation of Duration objects, thereby reducing memory overhead and potential garbage collection pauses in frequently executed code. This change contributes to a more performant and resource-efficient streaming data processing pipeline.

Highlights

• Performance Optimization: The pull request optimizes performance in Dataflow streaming workers by avoiding the creation of intermediate Duration objects in 'hot path' code sections.
• Direct Millisecond Retrieval: The method stopwatch().elapsed().toMillis() has been replaced with stopwatch().elapsed(TimeUnit.MILLISECONDS) to directly obtain elapsed time in milliseconds.
• Affected Files: This change is applied in DataflowExecutionContext.java and Work.java, specifically within methods related to processing time and latency attribution.

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