Add Hyperdisk-Balanced support in TPU v6e advanced yaml

[agrawalkhushi18]

This PR introduces support for Hyperdisk Balanced (HdB) as an optional, high-performance persistent storage solution for GKE TPU v6e blueprints.

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[gemini-code-assist]

Summary of Changes

Hello @agrawalkhushi18, 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 integrates Hyperdisk Balanced, Google Cloud's high-performance block storage, into the GKE TPU v6e blueprint. It provides the necessary configuration changes and comprehensive documentation to guide users through enabling this feature and validating its performance, offering a robust storage option for demanding workloads.

Highlights

• Hyperdisk Balanced Support: Introduced support for Hyperdisk Balanced (HDB) as an optional, high-performance persistent storage solution for GKE TPU v6e blueprints.
• Documentation Update: Updated the README.md with detailed instructions on how to enable Hyperdisk Balanced integration and how to test the Hyperdisk mount using an FIO benchmark.
• Configuration Changes: Modified the gke-tpu-v6-advanced.yaml to enable the persistent disk CSI driver and added commented-out modules for Hyperdisk Balanced setup and an FIO benchmark job template, allowing users to easily activate them.

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[gemini-code-assist]

Code Review

This pull request introduces support for Hyperdisk Balanced in the GKE TPU v6e advanced blueprint. The changes include documentation updates and additions to the YAML configuration. Overall, the implementation is good, but there are a few issues to address. Most critically, there's a duplicate module ID in the YAML file that will cause deployment failures if the new section is uncommented. I've also identified a security concern with the benchmark job running as root and a couple of best-practice and documentation improvements. My review includes specific suggestions to resolve these points.

[shubpal07]

LGTM.
Minor nits