No need for mark-as-final operation

[kachayev]

With #123 being merged the selector does not check if estimator was 'final' in the pipeline. Thus the API for marking is not needed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.83%. Comparing base (4950a16) to head (b863a90).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #128      +/-   ##
==========================================
- Coverage   91.85%   91.83%   -0.02%     
==========================================
  Files          43       43              
  Lines        3400     3392       -8     
==========================================
- Hits         3123     3115       -8     
  Misses        277      277              

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