Refactor example dataset download tests #457

Job	Run time
mypy	1m 41s
py3.13 \| macos \| integration tests	1m 42s
py3.13 \| macos \| unit tests	1m 42s
py3.13 \| ubuntu \| integration tests	1m 40s
py3.13 \| ubuntu \| unit tests	1m 41s
py3.13 \| windows \| integration tests	1m 38s
py3.10 \| ubuntu \| integration tests	1m 40s
py3.13 \| windows \| unit tests	1m 39s
py3.10 \| ubuntu \| unit tests	1m 40s
py3.11 \| ubuntu \| unit tests	1m 40s
py3.12 \| ubuntu \| unit tests	1m 41s
merge-test-artifacts	1s
	18m 25s

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