DOC: Download example datasets before doc build (#2591) #2503

Job	Run time
should run ci	6s
GHA Security Analysis using Zizmor	18s
cache-pixi-lock	1m 22s
build-and-upload-nightly-parcels	3m 2s
Unit tests: ubuntu \| pixi run -e test-minimum tests	9m 8s
TypeChecking: pixi run typing	1m 33s
Unit tests: windows \| pixi run -e test tests	17m 29s
Unit tests: ubuntu \| pixi run -e test-py311 tests	11m 8s
Unit tests: ubuntu \| pixi run -e test tests	7m 45s
Unit tests: ubuntu \| pixi run -e test-py313 tests	8m 44s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
merge-test-artifacts	0s
	1h 0m 35s

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