Type check ert.gui

[eivindjahren]

• [x] PR title captures the intent of the changes, and is fitting for release notes.
• [x] Added appropriate release note label
• [x] Commit history is consistent and clean, in line with the contribution guidelines.
• [x] Make sure tests pass locally (after every commit!)

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

Attention: Patch coverage is 79.95227% with 84 lines in your changes missing coverage. Please review.

Project coverage is 87.11%. Comparing base (67b0e46) to head (44ff307).

Files	Patch %	Lines
src/ert/gui/ertwidgets/listeditbox.py	40.00%	12 Missing :warning:
src/ert/gui/tools/workflows/run_workflow_widget.py	50.00%	12 Missing :warning:
src/ert/gui/simulation/view/update.py	37.50%	10 Missing :warning:
.../ert/gui/tools/plot/widgets/clearable_line_edit.py	52.63%	9 Missing :warning:
src/ert/gui/tools/file/file_dialog.py	55.55%	8 Missing :warning:
...t/gui/tools/plot/plot_ensemble_selection_widget.py	76.92%	6 Missing :warning:
src/ert/gui/simulation/run_dialog.py	82.75%	5 Missing :warning:
src/ert/gui/tools/plot/plot_window.py	63.63%	4 Missing :warning:
src/ert/gui/tools/plugins/process_job_dialog.py	60.00%	4 Missing :warning:
src/ert/gui/simulation/view/realization.py	86.36%	3 Missing :warning:
... and 8 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #8160 +/- ## ========================================== - Coverage 87.18% 87.11% -0.07% ========================================== Files 381 381 Lines 23669 23757 +88 Branches 619 630 +11 ========================================== + Hits 20635 20696 +61 - Misses 2953 2988 +35 + Partials 81 73 -8 ```

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