Samples(Storage): Add sample and test for ListBuckets With Partial Success

[mahendra-google]

This PR adds a new code sample and test for the ListBuckets operation using the ReturnPartialSuccess parameter in ListBucketOptions.

The ReturnPartialSuccess flag allows the API to return a list of buckets even if specific regions are temporarily unavailable, rather than failing the entire request. This sample demonstrates how to consume the resulting Reachable and Unreachable collections. Please see b/459649174. Note: - PR will be marked as ready to review once Google.Cloud.Storage.V1 new package is released.

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Here is the summary of changes.

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• storage/api/Storage.Samples/ListBucketsWithPartialSuccess.cs:15, tag storage_list_buckets_partial_success

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[gemini-code-assist[bot]]

Summary of Changes

Hello @mahendra-google, I'm Gemini Code Assist[^1]! 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 C# code sample and an accompanying test for the Google Cloud Storage client library. The sample demonstrates how to effectively use the ListBuckets operation with the ReturnPartialSuccess parameter, enabling the API to return available bucket information even when certain regions are temporarily inaccessible. This feature significantly improves the resilience of bucket listing by providing partial results rather than a complete failure, and the sample illustrates how to process both reachable and unreachable bucket collections.

Highlights

• New Sample Added: Introduced a new C# sample for the ListBuckets operation utilizing the ReturnPartialSuccess option.
• New Test Case: Implemented a corresponding XUnit test to validate the functionality of the new ListBucketsWithPartialSuccess sample.
• Dependency Update: Updated the Google.Cloud.Storage.V1 NuGet package to version 4.14.0.
• Test Fixture Enhancement: Enhanced the StorageFixture.CreateBucket method to allow specifying a storageClass for bucket creation, supporting test scenarios.

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[mahendra-google]

Converting this PR into draft mode as the latest Nuget package for Google.Cloud.Storage.V1 is not released yet (containing the ReturnPartialSuccess boolean flag in ListBucketOptions ). I will make this PR ready to review once the package is released.