Deduplicate MonitoringInfo in PortableMetrics

[Suvrat1629]

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---

fixes #32001 Merge attempted and committed MonitoringInfo by metric identity, prefer committed entries, and create MetricResult with the correct committed flag. Add unit test verifying deduplication and that the committed value wins .

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Summary of Changes

Hello @Suvrat1629, I'm Gemini Code Assist[^1]! 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 resolves an issue in PortableMetrics where attempted and committed metric entries could lead to redundant or ambiguous metric reporting. By introducing a robust deduplication strategy, the system now ensures that for any given metric identity, only a single, authoritative MonitoringInfo is retained, with a clear preference for committed values. This enhances the accuracy and clarity of metric results within the Apache Beam portable runner.

Highlights

• Metric Deduplication: Implemented a mechanism to deduplicate MonitoringInfo entries in PortableMetrics, resolving potential redundancy between attempted and committed metrics.
• Committed Value Preference: When both attempted and committed metrics exist for the same identity, the committed value is prioritized and used, ensuring data accuracy.
• Correct Committed Flag: MetricResult objects are now created with the accurate isCommitted flag, reflecting the true status of the metric.
• New Unit Test: A dedicated unit test was added to confirm the deduplication logic and the preference for committed metric values.

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[Suvrat1629]

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