test: add aggregated dataset to testing ldm #820

Job	Run time
Collect changes / collect-changes	8s
Python tests / lint-and-format-check	37s
Python tests / unit-tests (py313)	3m 5s
Python tests / unit-tests (py310)	3m 2s
Python tests / unit-tests (py39)	3m 2s
Python tests / unit-tests (py311)	3m 5s
Python tests / unit-tests (py312)	3m 6s
Python tests / types-check	1m 16s
status-check	4s
	17m 25s

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