Stabilize StorageApiDataTriggeredSchemaUpdateIT assertion

[aIbrahiim]

Related to #30730
Successful run: https://github.com/apache/beam/actions/runs/25366036447/job/74377001518?pr=38339

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Summary of Changes

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This pull request focuses on stabilizing integration tests within the Google Cloud Platform IO module. By adjusting stream configurations and relaxing strict assertion requirements to accommodate race conditions and non-deterministic behavior in distributed environments, the changes improve the reliability of the test suite.

Highlights

• StorageApiDataTriggeredSchemaUpdateIT Stabilization: Reduced the number of storage write API streams to 1 to minimize ordering issues and implemented a custom PAssert validator to handle race conditions during schema upgrades.
• GcsMatchIT Flakiness Fix: Updated the file size summation logic to account for potential skipped sizes during continuous matching on Dataflow, replacing a strict equality check with a range-based validation.
• Test Infrastructure: Updated the trigger file to ensure the relevant test suite is executed.

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Code Review

This pull request updates integration tests for BigQuery and GCS to handle non-deterministic behavior in Dataflow environments. In StorageApiDataTriggeredSchemaUpdateIT, the test now uses a custom verifier for dead-letter queue rows to account for potential races during schema upgrades, and the number of storage write streams was reduced to one. In GcsMatchIT, the assertion for file size sums was changed to a range-based check to accommodate skipped updates during continuous matching. Feedback was provided regarding a potential integer overflow in the new calculation for the minimum possible sum in GcsMatchIT.

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