Move deferral resolution from `merge_from_artifact` to `RuntimeRefResolver` #11294

Job	Run time
integration test metadata generation	1s
Test Log Schema (1)	3m 38s
Test Log Schema (2)	2m 55s
Test Log Schema (3)	3m 17s
Test Log Schema (4)	3m 35s
Test Log Schema (5)	3m 58s
Log Schema Test Suite	1s
	17m 25s

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