Feat(storage): add sample for list buckets partial success

[thiyaguk09]

This PR adds a new code sample and system test demonstrating how to handle Partial Success when listing Cloud Storage buckets.

The returnPartialSuccess feature is critical for building resilient applications. It allows the buckets() method to return successfully even if specific regions are experiencing downtime, providing a list of reachable buckets along with a list of unreachable resource paths.

Changes

• New Sample: Added storage_list_buckets_partial_success snippet.
• Logic: Implemented handling for the unreachable() method in BucketIterator.
• Testing: Added a system test to verify the snippet executes correctly and successfully communicates with the Storage API.

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Implementation Notes

• Assertion Strategy: I have included assertTrue(true) at the end of the system test. This serves as a "completion assertion" to explicitly confirm that the entire snippet executed and returned without throwing an exception, which is particularly useful in system tests where the network is involved.
• Unreachable Buckets: This is a system test hitting the live API. Under normal conditions, all Google Cloud regions are healthy, meaning the unreachable() array will be empty. Therefore, we do not assert specific "Unreachable" output strings to avoid false negatives. The test instead focuses on verifying the reachable Bucket: output, proving the API connection and the returnPartialSuccess configuration are working correctly.

[gemini-code-assist]

Summary of Changes

Hello @thiyaguk09, 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 introduces a new code sample and corresponding system test to illustrate how to effectively manage partial success scenarios when listing Google Cloud Storage buckets. By leveraging the returnPartialSuccess option, applications can now gracefully handle regional outages, ensuring that a list of accessible buckets is returned alongside any unreachable resource paths, thereby enhancing application resilience.

Highlights

• New Sample for Partial Success: Introduced a new PHP sample, storage_list_buckets_partial_success, demonstrating how to list Cloud Storage buckets while gracefully handling partial success scenarios due to regional downtime.
• Error Handling Logic: The new sample includes logic to check for and iterate through unreachable bucket locations using the unreachable() method of the BucketIterator, providing resilience against regional outages.
• System Test Coverage: Added a new system test, testListBucketsPartialSuccess, to verify the correct execution and API communication of the new partial success bucket listing sample.

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[gemini-code-assist]

Code Review

This pull request introduces a new code sample and a corresponding system test to demonstrate handling partial success when listing Cloud Storage buckets. The new sample, storage_list_buckets_partial_success, is well-implemented and clearly illustrates the usage of the returnPartialSuccess option. The added system test in storageTest.php validates the basic execution of the new snippet. However, the test includes a redundant assertion that should be removed for better code quality. Apart from that minor point, the changes are solid and effectively address the goal of the PR.