Use wait_for_child for getting RunDialog in test

[eivindjahren]

Quick cleanup of comment and fetching of RunDialog in test_restart_ensemble

• 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

[andreas-el]

💯

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.38%. Comparing base (e607feb) to head (bb7f4be).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8823      +/-   ##
==========================================
+ Coverage   91.31%   91.38%   +0.06%     
==========================================
  Files         342      342              
  Lines       21028    21028              
==========================================
+ Hits        19202    19216      +14     
+ Misses       1826     1812      -14     

Flag	Coverage Δ
cli-tests	39.62% <ø> (-0.02%)	⬇️
gui-tests	73.58% <ø> (+0.12%)	⬆️
performance-tests	50.05% <ø> (ø)
unit-tests	79.82% <ø> (-0.02%)	⬇️

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