Remove unused includes for table/row_operators

[GregoryKimball]

Description

After reviewing usages of the "legacy" row operators, several of the includes are no longer needed.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

Base: 87.49% // Head: 87.52% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (3369ee4) compared to base (dfd3d89).
Patch has no changes to coverable lines.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-22.12   #11857      +/-   ##
================================================
+ Coverage         87.49%   87.52%   +0.03%     
================================================
  Files               133      133              
  Lines             21807    21807              
================================================
+ Hits              19079    19087       +8     
+ Misses             2728     2720       -8     

Impacted Files	Coverage Δ
python/cudf/cudf/core/dataframe.py	93.77% <0.00%> (+0.04%)	⬆️
python/cudf/cudf/core/column/string.py	88.55% <0.00%> (+0.12%)	⬆️
python/cudf/cudf/core/groupby/groupby.py	91.22% <0.00%> (+0.21%)	⬆️
python/cudf/cudf/core/column/numerical.py	95.49% <0.00%> (+0.28%)	⬆️
python/cudf/cudf/core/tools/datetimes.py	84.49% <0.00%> (+0.30%)	⬆️
python/cudf/cudf/core/column/lists.py	93.75% <0.00%> (+0.96%)	⬆️
python/strings_udf/strings_udf/__init__.py	96.87% <0.00%> (+3.12%)	⬆️

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[GregoryKimball]

@gpucibot merge