ROX-31222: fix race in test

[parametalol]

Description

Using onChange to wait for the results.

User-facing documentation

• CHANGELOG.md is updated OR update is not needed
• documentation PR is created and is linked above OR is not needed

Testing and quality

• the change is production ready: the change is GA, or otherwise the functionality is gated by a feature flag
• CI results are inspected

Automated testing

• added unit tests
• added e2e tests
• added regression tests
• added compatibility tests
• modified existing tests

How I validated my change

CI

[rhacs-bot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.83%. Comparing base (796e1d9) to head (0cd6156).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #17227      +/-   ##
==========================================
- Coverage   48.84%   48.83%   -0.02%     
==========================================
  Files        2717     2717              
  Lines      203253   203218      -35     
==========================================
- Hits        99286    99248      -38     
- Misses      96150    96153       +3     
  Partials     7817     7817              

Flag	Coverage Δ
go-unit-tests	48.83% <ø> (-0.02%)	⬇️

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[parametalol]

/retest

[janisz]

I think we should test observed behaviour not internal state changes