Priority to BigQueryProject for executeExtract

[TanuSharma2511]

Resolves #36179

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[gemini-code-assist]

Summary of Changes

Hello @TanuSharma2511, 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 refines the BigQuery data extraction process within Apache Beam by introducing a more explicit project selection mechanism. It ensures that when performing BigQuery extract jobs, the system first attempts to use a specifically configured BigQuery project ID, thereby providing finer control and resolving potential ambiguities or misconfigurations where the default project might have been used unintentionally.

Highlights

• BigQuery Project Prioritization: The logic for determining the BigQuery project ID during extract operations has been updated to prioritize the BigQueryProject option. If BigQueryProject is specified, it will be used; otherwise, it falls back to the general project option.

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[github-actions]

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[github-actions]

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R: @Abacn for label java.

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[github-actions]

Reminder, please take a look at this pr: @Abacn

[Abacn]

Thanks, checked BigQueryIO read indeed checks getBigQueryProject in many places, in particular in BigQueryQuerySourceDef which is relevant to export read, therefore should be honored here as well