Refactor example dataset download tests #459

Job	Run time
mypy	3m 49s
py3.13 \| macos \| integration tests	15m 4s
py3.13 \| macos \| unit tests	9m 50s
py3.13 \| ubuntu \| integration tests	17m 2s
py3.13 \| ubuntu \| unit tests	13m 16s
py3.13 \| windows \| integration tests	31m 50s
py3.13 \| windows \| unit tests	21m 38s
py3.10 \| ubuntu \| integration tests	17m 5s
py3.10 \| ubuntu \| unit tests	13m 27s
py3.11 \| ubuntu \| unit tests	12m 51s
py3.12 \| ubuntu \| unit tests	13m 29s
merge-test-artifacts	2s
	2h 49m 23s

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