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 92.24%. Comparing base (a20125d) to head (c92f832).

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #16357    +/-   ##
========================================
  Coverage   92.24%   92.24%            
========================================
  Files        2227     2227            
  Lines      209614   209810   +196     
========================================
+ Hits       193351   193549   +198     
+ Misses      16263    16261     -2     

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