Add ratio_max for presampling strategies

[MaxiBoether]

I realized we also need to set ratio_max for presampling strategies, otherwise they cannot run 12.5% as well.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.31%. Comparing base (4d78544) to head (2be4ea6).

Files	Patch %	Lines
modyn/config/schema/pipeline/sampling/config.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #544   +/-   ##
=======================================
  Coverage   82.30%   82.31%           
=======================================
  Files         217      217           
  Lines       10118    10125    +7     
=======================================
+ Hits         8328     8334    +6     
- Misses       1790     1791    +1     

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[XianzheMa]

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[github-actions]

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