Hardcoding TPU7x region

[simrankaurb]

This PR hardcodes the region for TPU7x to bypass the bulk insert check

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• Test all changes with pre-commit in a local branch #
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[gemini-code-assist]

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 modifies the GKE TPU 7x daily test build configuration to hardcode the region and zone. This change bypasses the previous dynamic zone discovery mechanism, ensuring that the tests consistently run in a predefined geographical location, likely to stabilize the testing environment or address specific deployment requirements.

Highlights

• Configuration Update: Dynamic zone and region detection was disabled for the GKE TPU 7x daily build process.
• Hardcoded Values: The region and zone for the GKE TPU 7x daily build were explicitly set to "us-central1" and "us-central1-c" respectively.

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[gemini-code-assist]

Code Review

This pull request modifies gke-tpu-7x.yaml to hardcode the region and zone (us-central1 and us-central1-c) for the ansible-playbook command, replacing the previous dynamic zone discovery and region derivation logic which has been commented out. The review feedback points out a maintainability concern, suggesting that the commented-out code should either be fully removed if permanently replaced or include a clear explanation if it's a temporary measure, to prevent technical debt and confusion for future maintainers.