fix(bigquery-derive): propagate compile errors for invalid bigquery attributes

[dbolduc]

Fail compilation if there is an invalid macro attribute. (Previously it succeeded silently).

Fixes #6875

[gemini-code-assist]

Code Review

This pull request refactors the get_field_name helper function in the bigquery-derive crate to return a syn::Result<String> instead of a String, allowing proper propagation of parsing errors for invalid bigquery attributes. It also updates derive_from_row and derive_from_sql to validate all fields upfront and return compile errors if any attribute parsing fails, and adds corresponding unit tests to verify this behavior. There are no review comments, and I have no additional feedback to provide.

[codecov]

Codecov Report

❌ Patch coverage is 88.57143% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.17%. Comparing base (fb2c65c) to head (81cc112).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bigquery-derive/src/lib.rs	88.57%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6876      +/-   ##
==========================================
- Coverage   97.17%   97.17%   -0.01%     
==========================================
  Files         329      329              
  Lines      110459   110484      +25     
==========================================
+ Hits       107344   107366      +22     
- Misses       3115     3118       +3     

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