DM-36775: Refactor string length checking on dataframe->arrow conversion.

[erykoff]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Base: 85.29% // Head: 85.28% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (f3c3f11) compared to base (ee902a2).
Patch coverage: 80.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #747      +/-   ##
==========================================
- Coverage   85.29%   85.28%   -0.01%     
==========================================
  Files         260      260              
  Lines       34338    34336       -2     
  Branches     5800     5800              
==========================================
- Hits        29288    29284       -4     
- Misses       3815     3816       +1     
- Partials     1235     1236       +1     

Impacted Files	Coverage Δ
python/lsst/daf/butler/formatters/parquet.py	93.37% <80.00%> (-0.67%)	⬇️

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[cmsaunders]

Looks good to me.