get rid of ScikitLearn and packages check

[PasoStudio73]

the deps from ScikitLearn is unused here in SoleXplorer, but should stay because compatibility with SolePostHoc.
Now, since SolePostHoc no longer needs ScikitLearn, it's safe to remove the deps also in SoleXplorer.
Then would be nice to check if we can merge devs branches from SoleBase and SoleModels into their own main, to remove their sources deps, leaving only ModalDecisionTrees and SolePostHoc still in dev

[Copilot]

Copilot wasn't able to review any files in this pull request.

[codecov]

Codecov Report

❌ Patch coverage is 99.16667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.65%. Comparing base (4c8d8f3) to head (cb96cd1).
⚠️ Report is 22 commits behind head on main.

Files with missing lines	Patch %	Lines
src/partition.jl	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
+ Coverage   90.29%   95.65%   +5.35%     
==========================================
  Files           8        8              
  Lines         402      437      +35     
==========================================
+ Hits          363      418      +55     
+ Misses         39       19      -20     

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