fix: Accurate tracking of slice capacities across blocks #3512

Job	Run time
build-acvm-js	4m 12s
build-nargo	2m 18s
build-noirc-abi	4m 15s
ACVM JS (Node.js)	45s
ACVM JS (Browser)	1m 12s
noirc_abi	45s
noir-js-backend-barretenberg	45s
build-noir-wasm	2m 45s
Noir JS	1m 50s
noir_codegen	1m 6s
Integration Tests	10m 8s
noir_wasm	1m 19s
End	1s
	31m 21s

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