Use wait_for_child for getting RunDialog

[eivindjahren]

Issue
Simplifies for #8838

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[berland]

Does not solve flakyness, but valid as refactor.

[eivindjahren]

Does not solve flakyness, but valid as refactor.

Indeed, even failed on that commit, trying with increased timeout.

[berland]

🙏🏻

[eivindjahren]

Nope, times out also for 10s.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.39%. Comparing base (9f8d73a) to head (02f0ae4).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8839      +/-   ##
==========================================
+ Coverage   91.37%   91.39%   +0.01%     
==========================================
  Files         342      342              
  Lines       21028    21028              
==========================================
+ Hits        19215    19218       +3     
+ Misses       1813     1810       -3     

Flag	Coverage Δ
cli-tests	39.61% <ø> (+<0.01%)	⬆️
gui-tests	73.58% <ø> (ø)
performance-tests	50.05% <ø> (ø)
unit-tests	79.83% <ø> (+0.02%)	⬆️

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