test: add aggregated dataset to testing ldm #819

Job	Run time
Collect changes / collect-changes	8s
Python tests / lint-and-format-check	41s
Python tests / types-check	1m 23s
Python tests / unit-tests (py311)	3m 0s
Python tests / unit-tests (py313)	3m 10s
Python tests / unit-tests (py312)	3m 13s
Python tests / unit-tests (py310)	2m 55s
Python tests / unit-tests (py39)	2m 57s
status-check	9s
	17m 36s

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