feat(storage): migrate HMAC key samples and tests

[angelcaamal]

Description

Fixes Internal: b/495528937

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[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 significantly enhances the Google Cloud Storage Node.js samples by introducing a complete set of examples for managing HMAC keys. It provides developers with clear, executable code to perform various HMAC key operations, from creation to deletion, ensuring robust interaction with the Storage API. The inclusion of dedicated system tests guarantees the reliability and correctness of these new samples.

Highlights

• New HMAC Key Samples: Introduced a comprehensive set of Node.js samples for managing HMAC keys in Google Cloud Storage, including operations for activation, creation, deactivation, deletion, retrieval, and listing.
• System Tests: Added robust system tests to validate the functionality of all new HMAC key samples, ensuring their correctness and reliability.
• Utility Scripts and Resources: Included utility scripts for cleaning up test resources and added various test resource files to support the new samples and tests.
• Dependency Updates: Updated the package.json file to include necessary dependencies for the new samples and testing framework.

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[gemini-code-assist]

Code Review

This pull request adds several new sample files and tests for managing HMAC keys in Google Cloud Storage. The new samples demonstrate how to create, list, get, activate, deactivate, and delete HMAC keys.

My review focuses on improving code clarity and fixing a minor bug in a cleanup script. Specifically:

• In all the new sample files (hmacKey*.js), I've suggested making the main function async and awaiting the inner asynchronous function call. This is a best practice that makes the code's control flow easier to understand.
• In the storage/scripts/cleanup file, I've identified a redundant API call and suggested a simplification of the promise chain for better readability and correctness.

The changes are otherwise well-structured and the tests are comprehensive.