Remove ErtConfig from EverestRunModel #15121

Job	Run time
Test ert docs (3.12, ubuntu-latest)	51s
test-mac-main-everest	0s
test-mac-main-ert	0s
test-linux-ert (cli-tests, 3.11, ubuntu-latest) / Run ert tests	14m 20s
test-linux-ert (gui-tests, 3.11, ubuntu-latest) / Run ert tests	11m 11s
test-linux-ert (gui-tests, 3.12, ubuntu-latest) / Run ert tests	13m 41s
test-linux-ert (cli-tests, 3.12, ubuntu-latest) / Run ert tests	16m 34s
test-linux-ert (performance-and-unit-tests, 3.12, ubuntu-latest) / Run ert tests	9m 49s
test-linux-ert (performance-and-unit-tests, 3.11, ubuntu-latest) / Run ert tests	8m 20s
build-wheels (3.11) / build-wheels	13s
build-wheels (3.12) / build-wheels	11s
test-linux-everest (doc, 3.12, ubuntu-latest) / Run everest tests	39s
test-linux-everest (everest-models-test, 3.11, ubuntu-latest) / Run everest tests	1m 36s
test-linux-everest (everest-models-test, 3.12, ubuntu-latest) / Run everest tests	1m 54s
test-ert-with-flow (ubuntu-latest, 3.11) / Run ert tests	8m 39s
test-linux-everest (test, 3.11, ubuntu-latest) / Run everest tests	7m 3s
test-linux-everest (test, 3.12, ubuntu-latest) / Run everest tests	8m 4s
test-slurm (ubuntu-latest, 3.11) / Run ert tests	2m 1s
Publish to PyPI	0s
	1h 45m 6s

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