test: add aggregated dataset to testing ldm #832

Job	Run time
Collect changes / collect-changes	7s
Python tests / lint-and-format-check	37s
Python tests / unit-tests (py39)	3m 7s
Python tests / unit-tests (py313)	3m 21s
Python tests / unit-tests (py311)	3m 12s
Python tests / types-check	1m 20s
Python tests / unit-tests (py312)	3m 22s
Python tests / unit-tests (py310)	3m 10s
status-check	3s
	18m 19s

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