test: add aggregated dataset to testing ldm #821

Job	Run time
Collect changes / collect-changes	8s
Python tests / lint-and-format-check	39s
Python tests / types-check	1m 17s
Python tests / unit-tests (py312)	3m 16s
Python tests / unit-tests (py310)	2m 57s
Python tests / unit-tests (py39)	3m 9s
Python tests / unit-tests (py313)	3m 15s
Python tests / unit-tests (py311)	3m 13s
status-check	4s
	17m 58s

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