fix: proper cred loading for Databricks pt2. #545

Job	Run time
Collect changes / collect-changes	6s
Python tests / types-check	1m 5s
Python tests / lint-and-format-check	39s
Python tests / unit-tests (py313)	2m 48s
Python tests / unit-tests (py312)	5m 53s
Python tests / unit-tests (py311)	2m 14s
Python tests / unit-tests (py310)	2m 10s
Python tests / unit-tests (py39)	2m 29s
status-check	1s
	17m 25s

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