chore: deduplicate `ReturnConstant` warning #7235

Job	Run time
build-nargo	2m 23s
build-noirc-abi	2m 27s
build-noir-wasm	3m 46s
build-acvm-js	1m 20s
ACVM JS (Node.js)	41s
ACVM JS (Browser)	1m 27s
Example scripts	13s
Noir JS	1m 44s
noirc_abi	1m 30s
noir_codegen	57s
noir-js-backend-barretenberg	42s
Integration Tests (Node)	3m 41s
noir_wasm	1m 32s
Integration Tests (Browser)	5m 37s
End	1s
	28m 1s

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