feat: disable unused variable checks on low-level and oracle functions #2951

Job	Run time
build-nargo	2m 15s
build-acvm-js	4m 23s
build-noirc-abi	4m 25s
ACVM JS (Node.js)	38s
ACVM JS (Browser)	1m 14s
build-noir-wasm	2m 43s
noirc_abi	46s
Noir JS	1m 28s
noir_codegen	1m 8s
noir-js-backend-barretenberg	42s
noir_wasm	1m 8s
Integration Tests	9m 39s
End	1s
	30m 30s

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