test: add aggregated dataset to testing ldm #826

Job	Run time
Collect changes / collect-changes	10s
Python tests / lint-and-format-check	39s
Python tests / unit-tests (py312)	3m 13s
Python tests / unit-tests (py311)	3m 6s
Python tests / unit-tests (py39)	2m 59s
Python tests / types-check	1m 21s
Python tests / unit-tests (py313)	3m 18s
Python tests / unit-tests (py310)	3m 15s
status-check	4s
	18m 5s

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