fix: unconstrained fn mismatch is now a warning #11124

Job	Run time
build-nargo	2m 40s
build-noirc-abi	1m 39s
build-acvm-js	1m 25s
build-noir-wasm	4m 12s
ACVM JS (Browser)	1m 9s
ACVM JS (Node.js)	41s
noirc_abi	1m 16s
Check external repo - zac-williamson/noir-edwards	11s
Example scripts	16s
noir_codegen	59s
Noir JS	1m 12s
Integration Tests (Browser)	1m 58s
noir_wasm	2m 25s
Integration Tests (Node)	2m 30s
End	1s
	22m 34s

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