ignore group cv

[tdhock]

this CV simply removes the error message, useful for subtrain/validation splits (with auto_tuner).

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 64 lines in your changes are missing coverage. Please review.

Project coverage is 64.25%. Comparing base (6024174) to head (529c660).

Files	Patch %	Lines
R/ResamplingIgnoreGroupCV.R	0.00%	64 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##             main       #8       +/-   ##
===========================================
- Coverage   83.56%   64.25%   -19.31%     
===========================================
  Files           4        5        +1     
  Lines         213      277       +64     
===========================================
  Hits          178      178               
- Misses         35       99       +64     

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