test: add aggregated dataset to testing ldm #849

Job	Run time
Collect changes / collect-changes	9s
Python tests / lint-and-format-check	38s
Python tests / types-check	1m 24s
Python tests / unit-tests (py313)	1m 30s
Python tests / unit-tests (py312)	1m 28s
Python tests / unit-tests (py310)	1m 27s
Python tests / unit-tests (py311)	1m 28s
Python tests / unit-tests (py39)	1m 26s
status-check	3s
	9m 33s

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