fix: Reading nullable sliced / masked Categoricals from Parquet

[coastalwhite]

Fixes #20017.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 8 lines in your changes missing coverage. Please review.

Project coverage is 79.50%. Comparing base (85d078c) to head (be349c8).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...rs-parquet/src/arrow/read/deserialize/utils/mod.rs	71.42%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20024      +/-   ##
==========================================
+ Coverage   79.48%   79.50%   +0.01%     
==========================================
  Files        1556     1556              
  Lines      216493   216504      +11     
  Branches     2456     2456              
==========================================
+ Hits       172084   172127      +43     
+ Misses      43851    43819      -32     
  Partials      558      558              

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