docs(release): update changelog for the 2026-03 release

[scotthart]

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[gemini-code-assist]

Summary of Changes

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This pull request finalizes the release of version 3.3.0 of the google-cloud-cpp library. It updates the version number in the build files and changelog, and includes the latest API definitions.

Highlights

• Release Version Update: The pull request updates the project version from a release candidate (rc) to the final 3.3.0 version.
• Changelog Update: The changelog is updated to reflect the release date (2026-03) and includes details about new features and updates, specifically for Storage.
• API Definitions: Includes an update to the Google APIs interface definitions to the latest version.

Activity

• Version number updated in CMakeLists.txt, MODULE.bazel, and google/cloud/internal/version_info.h.
• Changelog updated with release date and Storage feature details.

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[gemini-code-assist]

Code Review

This pull request prepares for the v3.3.0 release. It updates the changelog with the release date and new features, and removes the -rc or rc pre-release suffix from version definitions in CMakeLists.txt, MODULE.bazel, and google/cloud/internal/version_info.h. The changes are consistent and correctly implement the necessary updates for a new release. I have reviewed the changes and found no issues.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.66%. Comparing base (03beb82) to head (d202764).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16042      +/-   ##
==========================================
+ Coverage   92.65%   92.66%   +0.01%     
==========================================
  Files        2339     2339              
  Lines      215286   215286              
==========================================
+ Hits       199467   199490      +23     
+ Misses      15819    15796      -23     

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