v2: Remove parameter scale

[dweindl]

parameterScale no longer exists in PEtab v2.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.86%. Comparing base (bf4055c) to head (31c8bfc).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #408      +/-   ##
==========================================
+ Coverage   73.74%   73.86%   +0.12%     
==========================================
  Files          62       62              
  Lines        6794     6764      -30     
  Branches     1198     1194       -4     
==========================================
- Hits         5010     4996      -14     
+ Misses       1323     1308      -15     
+ Partials      461      460       -1     

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[dilpath]

The scaling is still useful since tools like pyPESTO will use log- priors to automatically work with the parameters on log scale (I hope...). But fine to move that to pyPESTO.