ci: Use create simulator script for unit tests

[philipphofmann]

Call create-simulator.sh for unit tests to remove some duplicated code.

#skip-changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cf3bc5b) 89.257% compared to head (bafd2bf) 89.313%.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3669       +/-   ##
=============================================
+ Coverage   89.257%   89.313%   +0.055%     
=============================================
  Files          534       534               
  Lines        58974     58973        -1     
  Branches     21168     21168               
=============================================
+ Hits         52639     52671       +32     
+ Misses        5299      5271       -28     
+ Partials      1036      1031        -5     

see 11 files with indirect coverage changes

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