Fixes BigQueryIODynamicReadTest flakes

[stankiewicz]

Align FakeDatasetService and BigQueryServicesImpl behaviour on missing dataset when getTable is called.

BQServicesImpl.getTable() on 404 is returning null.

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[gemini-code-assist]

Summary of Changes

Hello @stankiewicz, 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 addresses test flakiness in BigQueryIODynamicReadTest by ensuring consistent behavior across BigQuery service implementations. It specifically modifies the FakeDatasetService to return null when a requested dataset is not found, aligning its response with the existing BigQueryServicesImpl which handles 404 errors in the same manner. This change prevents exceptions in test scenarios where a dataset might legitimately be absent.

Highlights

• Test Stability: Resolved flakiness in BigQueryIODynamicReadTest by standardizing error handling for missing datasets.
• API Behavior Alignment: Modified FakeDatasetService.getTableImpl to return null when a dataset is not found, mirroring the behavior of BigQueryServicesImpl for 404 responses.

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[github-actions]

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R: @Abacn for label java.

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[claudevdm]

This fix was included in #36919, sorry for hijacking your PR (didnt know it was included)