Fix dataframe incorrectly parse CSV when renameDuplicatedColumns is true

[asmirnov82]

Fixes #7240

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.83%. Comparing base (e14f22f) to head (ff6545f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7242   +/-   ##
=======================================
  Coverage   68.83%   68.83%           
=======================================
  Files        1453     1453           
  Lines      271562   271574   +12     
  Branches    28094    28094           
=======================================
+ Hits       186928   186946   +18     
+ Misses      77415    77409    -6     
  Partials     7219     7219           

Flag	Coverage Δ
Debug	68.83% <100.00%> (+<0.01%)	⬆️
production	63.35% <100.00%> (+<0.01%)	⬆️
test	89.04% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
src/Microsoft.Data.Analysis/DataFrame.IO.cs	83.50% <100.00%> (ø)
...Microsoft.Data.Analysis.Tests/DataFrame.IOTests.cs	99.14% <100.00%> (+<0.01%)	⬆️

... and 7 files with indirect coverage changes