Try make pre/post experiment hook test not flaky

[yngve-sk]

Issue
Resolves #9671

[codspeed-hq]

CodSpeed Performance Report

Merging #9677 will not alter performance

_{Comparing yngve-sk:25.01.08.make-prepostexp-test-not-flaky (c600b9b) with main (08ecc6a)}

Summary

✅ 24 untouched benchmarks

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.68%. Comparing base (843f4fd) to head (c600b9b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9677      +/-   ##
==========================================
- Coverage   91.70%   91.68%   -0.03%     
==========================================
  Files         425      425              
  Lines       26642    26649       +7     
==========================================
+ Hits        24433    24434       +1     
- Misses       2209     2215       +6     

Flag	Coverage Δ
cli-tests	39.76% <71.42%> (+<0.01%)	⬆️
everest-models-test	34.09% <42.85%> (+<0.01%)	⬆️
gui-tests	74.23% <42.85%> (-0.01%)	⬇️
integration-test	37.95% <42.85%> (-0.01%)	⬇️
performance-tests	51.54% <42.85%> (-0.01%)	⬇️
test	39.29% <42.85%> (+<0.01%)	⬆️
unit-tests	74.31% <100.00%> (-0.02%)	⬇️

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