fix(utils): remove redundant column in train_test_split()

[jitingxu1]

trafficstars

remove redundant column in train_test_split() add tests for columns

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.94%. Comparing base (f0263b9) to head (3ef8ef8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
+ Coverage   84.93%   84.94%   +0.01%     
==========================================
  Files          26       26              
  Lines        1918     1920       +2     
==========================================
+ Hits         1629     1631       +2     
  Misses        289      289              

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[jitingxu1]

the quartodoc error is an upstream issue: https://github.com/machow/quartodoc/issues/357