fix: Slice coercions #5243

Job	Run time
build-nargo	2m 20s
build-noirc-abi	2m 33s
build-acvm-js	2m 35s
build-noir-wasm	4m 22s
noirc_abi	51s
noir-js-backend-barretenberg	48s
ACVM JS (Browser)	1m 39s
ACVM JS (Node.js)	37s
noir_codegen	1m 8s
Noir JS	1m 38s
noir_wasm	1m 7s
Integration Tests (Node)	3m 53s
Integration Tests (Browser)	5m 23s
End	3s
	28m 57s

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