test: add aggregated dataset to testing ldm #811

Job	Run time
Collect changes / collect-changes	8s
Python tests / lint-and-format-check	44s
Python tests / types-check	1m 26s
Python tests / unit-tests (py310)	3m 10s
Python tests / unit-tests (py313)	3m 10s
Python tests / unit-tests (py312)	3m 10s
Python tests / unit-tests (py39)	2m 56s
Python tests / unit-tests (py311)	2m 55s
status-check	4s
	17m 43s

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