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Give real cf subprocess tests a budget for loading cf #1981

Job	Run time
build and typecheck (ubuntu-latest)	1m 18s
test (ubuntu-latest, unit)	2m 17s
test (ubuntu-latest, 2/2)	1m 32s
test (ubuntu-latest, 1/2)	1m 56s
live-e2e	0s
done	4s
	7m 7s