feat(storage): Add more test coverage for initial read ranges in AsyncClient::Open()

[kalragauri]

No description provided.

[gemini-code-assist]

Code Review

This pull request introduces comprehensive unit and integration tests for multi-range pre-warming, caching, and teardown safety in ObjectDescriptorImpl and AsyncClient. The reviewer feedback focuses on aligning the new test code with the repository style guide, specifically by replacing Abseil types (absl::optional, absl::string_view) with their standard library equivalents (std::optional, std::string_view), avoiding the use of auto when it obscures StatusOr return types, and ensuring auto is properly qualified or replaced with explicit types in range-based loops.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.26%. Comparing base (03e43d3) to head (b6792b4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16357      +/-   ##
==========================================
- Coverage   92.26%   92.26%   -0.01%     
==========================================
  Files        2237     2237              
  Lines      210434   210630     +196     
==========================================
+ Hits       194166   194340     +174     
- Misses      16268    16290      +22     

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