feat(storage): migrate bucket samples and tests

[angelcaamal]

Description

Fixes Internal: b/495409887

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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 wide array of new examples for managing GCS buckets. The additions cover fundamental operations as well as advanced configurations, providing developers with robust and practical code snippets. Accompanying these samples are new system tests to validate their functionality, ensuring high quality and reliability.

Highlights

• New Google Cloud Storage Bucket Samples: Introduced a comprehensive suite of new Node.js samples demonstrating various Google Cloud Storage bucket operations, including creation, metadata management, security configurations, and lifecycle policies.
• Expanded Bucket Functionality Coverage: Added samples for advanced features such as dual-region buckets, hierarchical namespaces, object retention, autoclass settings, public access prevention, soft delete policies, and Recovery Point Objective (RPO) configurations.
• Dedicated System Tests: Implemented a new system test file (buckets.test.js) to ensure the correctness and reliability of all newly added bucket samples.
• New Module Structure: Established a dedicated storage/ directory with its own package.json and cleanup script, streamlining the management and testing of these storage-related samples.

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[gemini-code-assist]

Code Review

This pull request introduces a comprehensive suite of new Node.js samples for Google Cloud Storage bucket management, covering various operations such as creating specialized buckets (e.g., dual-region, hierarchical namespace, object retention, with specific storage classes and locations), and managing bucket metadata like labels, CORS, website configurations, versioning, default KMS keys, uniform bucket-level access, public access prevention, RPO, soft delete policies, and autoclass settings. The changes also include updates to package.json, .gitignore, and test resources. Review comments indicate a bug in system-test/buckets.test.js where a test for hierarchical namespace bucket creation incorrectly asserts properties of a different bucket, and an improvement opportunity in storage/scripts/cleanup to simplify a redundant and complex promise chain for deleting files and buckets.