fix(experimental elaborator): Don't check return type for trait methods #7193

Job	Run time
build-nargo	1m 16s
build-noirc-abi	1m 15s
build-noir-wasm	1m 4s
build-acvm-js	1m 14s
ACVM JS (Browser)	1s
ACVM JS (Node.js)	1s
noirc_abi	1s
Integration Tests (Browser)	1s
noir-js-backend-barretenberg	1s
Example scripts	1s
Integration Tests (Node)	1s
noir_codegen	1s
Noir JS	1s
noir_wasm	1s
End	1s
	5m 0s

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