test: add aggregated dataset to testing ldm #932

Job	Run time
Collect changes / collect-changes	9s
Python tests / lint-and-format-check	41s
Python tests / unit-tests (py311)	3m 1s
Python tests / unit-tests (py312)	7m 23s
Python tests / types-check	1m 21s
Python tests / unit-tests (py39)	3m 8s
Python tests / unit-tests (py310)	2m 54s
Python tests / unit-tests (py313)	3m 40s
status-check	2s
	22m 19s

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