Refactor: Migrate conformance tests to StorageTransport and enhance retry logic

[thiyaguk09]

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Fixes #<issue_number_goes_here> 🦕

[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 refactors the internal conformance tests by migrating them to use the StorageTransport class. This change standardizes how HTTP requests are made and how retries are handled, moving away from direct client methods to a more unified transport layer. The update also introduces more robust retry logic, ensuring that requests are only retried when safe and appropriate, based on HTTP methods and preconditions. This improves the reliability and maintainability of the test suite and the underlying client library.

Highlights

• Conformance Test Migration: Refactored conformance tests to directly utilize the StorageTransport class, centralizing HTTP request handling and retry logic for consistency.
• Enhanced Retry Logic: Updated the default retryable error function to intelligently consider HTTP methods and the presence of preconditions (e.g., ifGenerationMatch) when determining if a request should be retried.
• CI/CD Streamlining: Removed the 'docs' job and its corresponding status check from the CI/CD configuration, simplifying the build process.
• Test Bench Update: Upgraded the Storage Testbench Docker image version to v0.60.0 for improved testing capabilities.

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[gemini-code-assist]

Code Review

The pull request refactors Google Cloud Storage conformance tests to directly use StorageTransport.makeRequest for API calls, bypassing higher-level client methods, and updates the testbench Docker image. It also removes the docs CI job and related settings. Review comments highlight a bug in the create function's bucketExists check, where a 404 error was not handled, causing premature exit, and suggest an optimization to reuse the Gaxios instance in the authClient.request mock for efficiency.

[gemini-code-assist]

Creating a new Gaxios instance for every authClient.request call within this mock can be inefficient, especially if this mock is called frequently. While this is a test utility, reusing a single Gaxios instance might offer a slight performance improvement and better reflect how Gaxios is typically used in production code.

Consider initializing gaxios once outside the request function and reusing it.

authClient.request = async opts => {
  const gaxios = new Gaxios();
  return gaxios.request(opts);
};