test: add aggregated dataset to testing ldm #853

Job	Run time
Collect changes / collect-changes	12s
Python tests / unit-tests (py311)	3m 1s
Python tests / unit-tests (py313)	3m 10s
Python tests / unit-tests (py312)	3m 11s
Python tests / unit-tests (py39)	3m 4s
Python tests / unit-tests (py310)	2m 56s
Python tests / types-check	1m 22s
Python tests / lint-and-format-check	36s
status-check	4s
	17m 36s

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