test: add aggregated dataset to testing ldm #897

Job	Run time
Collect changes / collect-changes	8s
Python tests / lint-and-format-check	37s
Python tests / unit-tests (py313)	3m 9s
Python tests / unit-tests (py310)	2m 54s
Python tests / unit-tests (py312)	3m 8s
Python tests / unit-tests (py39)	3m 1s
Python tests / types-check	1m 19s
Python tests / unit-tests (py311)	3m 1s
status-check	3s
	17m 20s

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