chore: add retry for incompatible operation in progress

[apeabody]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @apeabody, 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 improves the reliability of integration tests by configuring them to automatically retry operations that encounter an 'incompatible operation in progress' error. By recognizing this specific error as retryable, the tests can better handle transient cluster states, reducing flakiness and ensuring more accurate test results without immediate failure.

Highlights

• Retryable Error Handling: Added a new retryable error pattern to test/integration/testutils/utils.go to specifically handle 'Incompatible operation in progress' errors.
• Integration Test Robustness: The change aims to make integration tests more robust by allowing them to retry when encountering a specific cluster state error (HTTP 400 'Cluster is running incompatible operation').

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[gemini-code-assist]

Code Review

This pull request adds a retry mechanism for 'incompatible operation in progress' errors, which can occur transiently in GKE clusters. The change is straightforward, adding a new entry to the RetryableTransientErrors map. I've suggested a small improvement to make the regular expression more precise to avoid matching unintended errors.