test: add aggregated dataset to testing ldm #835

Job	Run time
Collect changes / collect-changes	8s
Python tests / lint-and-format-check	43s
Python tests / types-check	1m 19s
Python tests / unit-tests (py310)	3m 2s
Python tests / unit-tests (py312)	3m 17s
Python tests / unit-tests (py39)	3m 2s
Python tests / unit-tests (py311)	3m 6s
Python tests / unit-tests (py313)	3m 16s
status-check	5s
	17m 58s

Provide feedback