Have Ert sidebar have correct focus on startup and when simulating

[andreas-el]

Issue
Resolves #9538

• 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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.86%. Comparing base (72babc5) to head (3e2f7b2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9548      +/-   ##
==========================================
+ Coverage   91.85%   91.86%   +0.01%     
==========================================
  Files         433      433              
  Lines       26767    26768       +1     
==========================================
+ Hits        24586    24591       +5     
+ Misses       2181     2177       -4     

Flag	Coverage Δ
cli-tests	39.78% <0.00%> (-0.01%)	⬇️
everest-models-test	34.67% <0.00%> (-0.03%)	⬇️
gui-tests	72.15% <100.00%> (+<0.01%)	⬆️
integration-test	37.21% <0.00%> (-0.03%)	⬇️
performance-tests	51.97% <0.00%> (-0.01%)	⬇️
test	40.48% <0.00%> (-0.01%)	⬇️
unit-tests	74.17% <100.00%> (+0.04%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #9548 will not alter performance

_{Comparing andreas-el:set_simulation_button_default_selected (3e2f7b2) with main (72babc5)}

Summary

✅ 23 untouched benchmarks

[berland]

🖱️

[AugustoMagalhaes]

When working on a new issue I've realized I've forgot to mark this as default (I'm sorry for that btw), but also that when simulation starts there is no selection change to the "Simulation status" button (self.results_button). If you want, you could also add this code to post_init function to achieve that:

 def post_init(self) -> None:
        experiment_panel = ExperimentPanel(
            self.ert_config,
            self.notifier,
            self.config_file,
            self.facade.get_ensemble_size(),
        )
        # This code snippet below
        experiment_panel.experiment_started.connect(
            lambda: self.results_button.setChecked(True)
        )
...

[andreas-el]

This makes sense. Nice catch @AugustoMagalhaes !

[berland]

Looks smooth!