chore(storage): minor corrections for performance while pushing back unreachable buckets to vector

[bajajneha27]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @bajajneha27, 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 minor refinements to the storage client library. It includes a small performance optimization in how unreachable bucket names are added to a vector during response parsing, and a documentation correction to improve clarity regarding the ReturnPartialSuccess option.

Highlights

• Performance Optimization: Replaced emplace_back with push_back when adding std::string elements to the unreachable vector in ListBucketsResponse parsing, aiming for minor performance improvements.
• Documentation Correction: Updated a comment in well_known_parameters.h to accurately describe the ReturnPartialSuccess option, changing 'unreachable regions' to 'unreachable resources'.

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[gemini-code-assist]

Code Review

This pull request makes a minor performance improvement by using push_back instead of emplace_back for temporary objects, which is consistent with the Google C++ style guide. It also corrects a comment in well_known_parameters.h. I've suggested a further performance improvement in bucket_requests.cc by reserving memory for the vector to avoid reallocations.

[gemini-code-assist]

Since this change is for performance, we can further improve it by reserving space in the vector before populating it. This avoids multiple reallocations if there are many unreachable locations. We can also simplify the loop by iterating directly over the JSON array elements instead of using .items().

    auto const& unreachable = json["unreachable"];
    result.unreachable.reserve(unreachable.size());
    for (auto const& location : unreachable) {
      result.unreachable.push_back(location.get<std::string>());
    }

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.94%. Comparing base (a202418) to head (91b670f).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15803      +/-   ##
==========================================
- Coverage   92.95%   92.94%   -0.01%     
==========================================
  Files        2458     2458              
  Lines      227548   227548              
==========================================
- Hits       211518   211499      -19     
- Misses      16030    16049      +19     

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