removed: deprecated preparestate! method

[franckgaga]

The method is associated to SimModel objects. This is not a normal use of the function so it should not affect anyone.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.42%. Comparing base (4ab5d3b) to head (d552a76).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #324      +/-   ##
==========================================
- Coverage   98.42%   98.42%   -0.01%     
==========================================
  Files          29       29              
  Lines        5397     5394       -3     
==========================================
- Hits         5312     5309       -3     
  Misses         85       85              

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