Fix ML flakes

[aIbrahiim]

Fixes: #31285
Successful run: https://github.com/apache/beam/actions/runs/24076537457

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Summary of Changes

Hello, 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 intermittent test failures and runtime issues related to machine learning components. By improving the validation logic for GPU availability and relaxing the constraints on network-dependent integration tests, the changes aim to stabilize the CI/CD pipeline and runtime environment.

Highlights

• Robust CUDA Detection: Introduced a more reliable check for CUDA availability by attempting to allocate a tensor, preventing false positives in environments where drivers are misconfigured.
• Increased Test Resilience: Updated Milvus integration tests to increase retry attempts and delay intervals, reducing flakiness during connection establishment.

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