feat(storage): migrate encryption samples and tests

[angelcaamal]

Description

Fixes Internal: b/495529210

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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 expands the Google Cloud Storage Node.js samples by introducing a suite of new examples and corresponding system tests focused on various encryption scenarios. The additions cover key management, file operations with Customer-Supplied Encryption Keys (CSEK), and the migration of encryption types to Customer-Managed Encryption Keys (CMEK). This enhancement aims to provide developers with robust, tested code examples for implementing secure storage solutions.

Highlights

• New Encryption Samples: Introduced a comprehensive set of new samples for Google Cloud Storage encryption operations, covering key generation, uploading, downloading, and rotating files with Customer-Supplied Encryption Keys (CSEK).
• CSEK to CMEK Conversion: Added a new sample demonstrating the conversion of a file from Customer-Supplied Encryption Key (CSEK) to Customer-Managed Encryption Key (CMEK).
• System Tests: Implemented robust system tests to validate the functionality and correctness of all new encryption samples.

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[gemini-code-assist]

Code Review

This pull request migrates several encryption-related samples and their corresponding tests. The new samples are a great addition. However, I've found a few critical bugs in the sample code and tests that need to be addressed. These include incorrect API usage for key rotation, flawed logic in a system test that fetches metadata for the wrong file, and incorrect default parameter values that would cause samples to fail. I've provided specific comments and suggestions for fixes below.