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refactor(inference-cost): dedupe twin helpers, traversals, and fixtures #2561

Job	Run time
build	21s
test (4/4)	43s
static-analysis	51s
test (3/4)	1m 10s
test (1/4)	39s
test (2/4)	59s
test (one-process pollution detector)	-1s
prettier	2s
eslint	3s
typecheck	4s
test (src)	2s
build-and-test	3s
	4m 56s