chore: Migrate gsutil usage to gcloud storage

[gurusai-voleti]

Automated: Migrate {target_path} from gsutil to gcloud storage

This CL is part of the on going effort to migrate from the legacy gsutil tool to the new and improved gcloud storage command-line interface.
gcloud storage is the recommended and modern tool for interacting with Google Cloud Storage, offering better performance, unified authentication, and a more consistent command structure with other gcloud components. 🚀

Automation Details

This change was generated automatically by an agent that targets users of gsutil.
The transformations applied are based on the gsutil to gcloud storage migration guide.

⚠️ Action Required: Please Review and Test Carefully

While we have based the automation on the migration guide, every use case is unique.
It is crucial that you thoroughly test these changes in environments appropriate to your use-case before merging.
Be aware of potential differences between gsutil and gcloud storage that could impact your workflows.
For instance, the structure of command output may have changed, requiring updates to any scripts that parse it. Similarly, command behavior can differ subtly; the gcloud storage rsync command has a different file deletion logic than gsutil rsync, which could lead to unintended file deletions.

Our migration guides can help guide you through a list of mappings and some notable differences between the two tools.

Standard presubmit tests are run as part of this CL's workflow. If you need to target an additional test workflow or require assistance with testing, please let us know.

Please verify that all your Cloud Storage operations continue to work as expected to avoid any potential disruptions in production.

Support and Collaboration

The GCS CLI team is here to help! If you encounter any issues, have a complex use case that this automated change doesn't cover, or face any other blockers, please don't hesitate to reach out.
We are happy to work with you to test and adjust these changes as needed.

Contact: gcs-cli-hyd@google.com

We appreciate your partnership in this important migration effort!

#gsutil-migration

[gemini-code-assist]

Summary of Changes

Hello @gurusai-voleti, 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 automates the migration of Google Cloud Storage command-line operations from the legacy gsutil tool to the modern gcloud storage interface. The primary goal is to leverage gcloud storage for its improved performance, unified authentication, and consistent command structure within the gcloud ecosystem. The change specifically updates cp commands in a Kokoro script, reflecting the new recommended approach for interacting with Cloud Storage.

Highlights

• Migration to gcloud storage: The pull request updates commented examples in .kokoro/trampoline_v2.sh to use gcloud storage cp instead of gsutil cp, aligning with the recommended Google Cloud Storage command-line interface.
• Automated Change: This change was automatically generated by an agent as part of a broader effort to migrate users from the legacy gsutil tool to the modern gcloud storage CLI.

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[gemini-code-assist]

Code Review

This pull request correctly migrates the gsutil cp commands to gcloud storage cp within the commented example lines in .kokoro/trampoline_v2.sh. This change aligns with the stated goal of migrating from gsutil to gcloud storage and is a straightforward application of the new command syntax. The update to the example commands is accurate and helpful for users following the migration.

[Linchin]

Since this auto-generated PR is altering code synced from template, the author needs to contact the related team to make the change, otherwise the change would be overwritten.