test: add aggregated dataset to testing ldm #823

Job	Run time
Collect changes / collect-changes	9s
Python tests / lint-and-format-check	45s
Python tests / unit-tests (py313)	3m 12s
Python tests / unit-tests (py311)	3m 4s
Python tests / unit-tests (py39)	2m 59s
Python tests / types-check	1m 19s
Python tests / unit-tests (py310)	2m 59s
Python tests / unit-tests (py312)	3m 13s
status-check	4s
	17m 44s

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