fix retry scenario for query to table materialization

[stankiewicz]

Fixes #36911

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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 a bug where BigQuery query-to-table materialization operations could fail upon retry due to the persistence of temporary tables from prior failed attempts. By proactively checking for and removing these stale temporary tables, the change ensures the robustness and correctness of BigQuery write operations, particularly in scenarios involving retries.

Highlights

• BigQuery Query Retries: When a BigQuery query-to-table materialization operation is retried, a temporary table from a previous failed attempt might persist. This PR introduces a mechanism to explicitly remove such existing temporary tables before proceeding with the query, ensuring correctness and preventing potential conflicts.
• Temporary Table Management: A new utility method, "removeDestinationIfExists", has been added to "BigQueryStorageQuerySource" to handle the conditional deletion of temporary BigQuery tables. This method identifies the temporary table based on job options and deletes it if it already exists.

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[damccorm]

Thanks!