test: add aggregated dataset to testing ldm #825

Job	Run time
Collect changes / collect-changes	9s
Python tests / lint-and-format-check	35s
Python tests / types-check	1m 18s
Python tests / unit-tests (py313)	3m 18s
Python tests / unit-tests (py311)	3m 5s
Python tests / unit-tests (py312)	3m 17s
Python tests / unit-tests (py39)	3m 2s
Python tests / unit-tests (py310)	3m 9s
status-check	2s
	17m 55s

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