Refactor example dataset download tests #458

Job	Run time
py3.13 \| macos \| unit tests	9m 24s
mypy	3m 53s
py3.13 \| macos \| integration tests	16m 31s
py3.13 \| ubuntu \| unit tests	13m 2s
py3.13 \| windows \| unit tests	21m 6s
py3.13 \| ubuntu \| integration tests	17m 56s
py3.10 \| ubuntu \| unit tests	12m 31s
py3.13 \| windows \| integration tests	31m 53s
py3.11 \| ubuntu \| unit tests	12m 59s
py3.10 \| ubuntu \| integration tests	17m 57s
py3.12 \| ubuntu \| unit tests	13m 16s
merge-test-artifacts	2s
	2h 50m 30s

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