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 (cd78f00) with main (60fc8f8)}

Summary

✅ 24 untouched benchmarks

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.66%. Comparing base (957b377) to head (cd78f00).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9677      +/-   ##
==========================================
- Coverage   91.67%   91.66%   -0.01%     
==========================================
  Files         424      424              
  Lines       26511    26552      +41     
==========================================
+ Hits        24305    24340      +35     
- Misses       2206     2212       +6     

Flag	Coverage Δ
cli-tests	39.75% <66.66%> (+0.06%)	⬆️
everest-models-test	34.10% <66.66%> (+0.03%)	⬆️
gui-tests	74.24% <66.66%> (+<0.01%)	⬆️
integration-test	37.98% <66.66%> (+0.14%)	⬆️
performance-tests	51.52% <66.66%> (+0.04%)	⬆️
test	39.32% <66.66%> (+0.14%)	⬆️
unit-tests	74.20% <100.00%> (+0.01%)	⬆️

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