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fix(tools): persist idle promotion prune after fold #3007

Job	Run time
build	9s
test (4/4)	34s
test (1/4)	1m 2s
test (2/4)	35s
test (3/4)	1m 5s
static-analysis	52s
test (one-process pollution detector)	0s
eslint	4s
typecheck	3s
prettier	3s
test (src)	3s
build-and-test	3s
	4m 33s