fix nan handling for MC CM CBPE realized performance

[nikml]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.98%. Comparing base (a24ab81) to head (fe9f5d7).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...performance_estimation/confidence_based/metrics.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #400      +/-   ##
==========================================
+ Coverage   76.80%   76.98%   +0.18%     
==========================================
  Files         108      108              
  Lines        9264     9267       +3     
  Branches     1656     1656              
==========================================
+ Hits         7115     7134      +19     
+ Misses       1685     1674      -11     
+ Partials      464      459       -5     

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