DM-38063: Ensure that all Parquet files are written with row groups.

[erykoff]

Checklist

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

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (79aeedf) 87.74% compared to head (f2310b0) 87.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #822      +/-   ##
==========================================
+ Coverage   87.74%   87.76%   +0.01%     
==========================================
  Files         268      268              
  Lines       34929    34975      +46     
  Branches     7347     7355       +8     
==========================================
+ Hits        30650    30696      +46     
  Misses       3125     3125              
  Partials     1154     1154              

Impacted Files	Coverage Δ
python/lsst/daf/butler/formatters/parquet.py	94.05% <100.00%> (+0.33%)	⬆️
tests/test_parquet.py	99.14% <100.00%> (+0.02%)	⬆️

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