fix: resolve Symbol::For overload ambiguity

[umuoy1]

Remove the std::string overload from Symbol::For to avoid ambiguity when a type is convertible to both std::string and std::string_view.

Calls with std::string arguments remain supported through implicit conversion to std::string_view.

Fixes #1741

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.65%. Comparing base (a815332) to head (9af66ff).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1742      +/-   ##
==========================================
- Coverage   63.69%   63.65%   -0.04%     
==========================================
  Files           3        3              
  Lines        2063     2061       -2     
  Branches      730      730              
==========================================
- Hits         1314     1312       -2     
  Misses        162      162              
  Partials      587      587              

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