samples(storage): add sample for ListBuckets with ReturnPartialSuccess

[cpriti-os]

Description

Fixes #

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Checklist

• I have followed Contributing Guidelines from CONTRIBUTING.MD
• Tests pass: go test -v ./.. (see Testing)
• Code formatted: gofmt (see Formatting)
• Vetting pass: go vet (see Formatting)
• 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 sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners 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

[snippet-bot]

Here is the summary of changes.

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• storage/buckets/list_buckets_partial_success.go:17, tag storage_list_buckets_partial_success

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[gemini-code-assist]

Summary of Changes

Hello @cpriti-os, 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 Go sample for Google Cloud Storage, specifically demonstrating how to list buckets in a project while gracefully handling scenarios where some buckets might be unreachable. It leverages the ReturnPartialSuccess feature to provide a comprehensive view of both accessible and inaccessible buckets, enhancing robustness in bucket listing operations.

Highlights

• New Sample for Listing Buckets with Partial Success: A new Go sample, listBucketsPartialSuccess, has been added to demonstrate how to list Google Cloud Storage buckets while also identifying any unreachable buckets. This leverages the ReturnPartialSuccess option of the bucket iterator.
• New System Test: A corresponding system test, TestListBucketsPartialSuccess, was added to storage/buckets/buckets_test.go to verify the functionality of the new sample, ensuring it correctly processes both reachable and unreachable bucket information.
• Test File Updates (with merge conflicts): The storage/transfer_manager/download_chunks_concurrently_test.go file received updates to its TestMain function for test resource setup and teardown, and modifications to TestDownloadChunksConcurrently for temporary file handling and cleanup. Note that this file contains unresolved merge conflict markers.

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[gemini-code-assist]

Code Review

This pull request introduces a new sample for listing buckets with ReturnPartialSuccess, which is well-implemented along with its test. However, there's a critical issue in storage/transfer_manager/download_chunks_concurrently_test.go which contains unresolved merge conflicts. These changes also seem unrelated to the PR's main goal. Please resolve the conflicts and consider submitting the unrelated changes in a separate PR.