Port old style forward models to plugin format #7818

Job	Run time
Run C++ tests and coverage (ubuntu-latest)	1m 30s
build-mac-for-tags	0s
build-linux (3.10) / build-wheels	1m 39s
build-linux (3.11) / build-wheels	1m 39s
build-linux (3.12) / build-wheels	1m 40s
build-linux (3.8) / build-wheels	1m 41s
build-linux (3.9) / build-wheels	1m 45s
test-mac-for-tags	0s
build-mac (3.12, macos-latest) / build-wheels	1m 2s
test-mac (integration-tests, 3.12, macos-latest) / Run ert tests	12m 42s
test-mac (gui-test, 3.12, macos-latest) / Run ert tests	13m 11s
test-mac (unit-tests, 3.12, macos-latest) / Run ert tests	11m 56s
Test ert docs (3.12, ubuntu-latest)	2m 14s
test-linux (gui-test, 3.12, ubuntu-latest) / Run ert tests	11m 0s
test-linux (gui-test, 3.11, ubuntu-latest) / Run ert tests	9m 33s
test-linux (gui-test, 3.8, ubuntu-latest) / Run ert tests	9m 56s
test-linux (integration-tests, 3.11, ubuntu-latest) / Run ert tests	7m 22s
test-linux (integration-tests, 3.12, ubuntu-latest) / Run ert tests	7m 39s
test-linux (integration-tests, 3.8, ubuntu-latest) / Run ert tests	8m 4s
test-linux (unit-tests, 3.11, ubuntu-latest) / Run ert tests	6m 39s
test-linux (unit-tests, 3.12, ubuntu-latest) / Run ert tests	7m 39s
test-linux (unit-tests, 3.8, ubuntu-latest) / Run ert tests	7m 45s
test-slurm (ubuntu-latest, 3.11) / Run ert tests	1m 42s
test-slurm (ubuntu-latest, 3.12) / Run ert tests	2m 5s
test-slurm (ubuntu-latest, 3.8) / Run ert tests	1m 48s
Publish to PyPI	0s
	2h 12m 11s

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