Save relative paths and omit filenames when saving simulation paths in the simulation campaign config

[GianlucaFicarelli]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (0e7cd7f) 77.90% compared to head (ab750be) 77.91%.

Files	Patch %	Lines
src/blueetl/campaign/config.py	88.88%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   77.90%   77.91%   +0.01%     
==========================================
  Files          43       43              
  Lines        2439     2436       -3     
  Branches      463      460       -3     
==========================================
- Hits         1900     1898       -2     
- Misses        485      486       +1     
+ Partials       54       52       -2     

Flag	Coverage Δ
pytest	77.91% <88.88%> (+0.01%)	⬆️

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