Fixture in `test_examples.py` to clean up generated data files #293

Job	Run time
mypy	3m 50s
py3.12 \| macos \| integration tests	13m 53s
py3.12 \| macos \| unit tests	13m 15s
py3.12 \| ubuntu \| unit tests	13m 20s
py3.12 \| ubuntu \| integration tests	18m 3s
py3.12 \| windows \| unit tests	21m 22s
py3.12 \| windows \| integration tests	32m 31s
py3.10 \| ubuntu \| unit tests	12m 38s
py3.11 \| ubuntu \| unit tests	12m 31s
merge-test-artifacts	2s
	2h 21m 25s

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