[Release-2.69] Cherry-pick #36564 into release branch

[Abacn]

Fix BigQueryIO File load validate runtime value provider (#36564)

• Fix BigQuerrIO File load validate runtime value provider

• Dedup test case

Please add a meaningful description for your change here

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[gemini-code-assist]

Summary of Changes

Hello @Abacn, 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 cherry-picks a critical fix from an earlier change (#36564) into the Release-2.69 branch. The primary objective is to enhance the robustness of BigQueryIO's temporary GCS location handling by addressing an edge case where an empty custom location string was not properly managed. Additionally, a related test case has been updated to improve its relevance and efficiency within the test suite.

Highlights

• BigQueryIO Temp Location Validation: Refined the validation logic within BatchLoads.java to correctly handle scenarios where a custom GCS temporary location is provided as an empty string, ensuring it gracefully falls back to the default pipeline temporary location.
• Test Case Refinement: Modified the testCustomGcsTempLocationNull test in BigQueryIOWriteTest.java to conditionally execute, skipping the test when streaming or Storage API contexts are active, thus preventing irrelevant test runs.

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