test: add aggregated dataset to testing ldm #899

Job	Run time
Collect changes / collect-changes	9s
Python tests / lint-and-format-check	40s
Python tests / unit-tests (py310)	2m 51s
Python tests / unit-tests (py313)	3m 7s
Python tests / unit-tests (py39)	2m 58s
Python tests / types-check	1m 17s
Python tests / unit-tests (py311)	2m 59s
Python tests / unit-tests (py312)	3m 5s
status-check	3s
	17m 9s

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