Fix capturing of ForwardModelStepWarning

[eivindjahren]

Fixes an issue where ForwardModelStepWarning did not show in Suggestor

• 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

[jonathan-eq]

Very good improvement :)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.61702% with 3 lines in your changes missing coverage. Please review.

Project coverage is 91.34%. Comparing base (4bba695) to head (87ed7d4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ert/gui/main.py	88.88%	2 Missing ⚠️
src/ert/config/capture_validation.py	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8857      +/-   ##
==========================================
- Coverage   91.35%   91.34%   -0.01%     
==========================================
  Files         343      344       +1     
  Lines       21087    21102      +15     
==========================================
+ Hits        19263    19276      +13     
- Misses       1824     1826       +2     

Flag	Coverage Δ
cli-tests	39.61% <31.91%> (+0.04%)	⬆️
gui-tests	73.53% <93.61%> (+0.04%)	⬆️
performance-tests	50.20% <36.17%> (+0.03%)	⬆️
unit-tests	79.91% <89.36%> (+0.02%)	⬆️

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