fix: Do not warn on unused self in traits #14191

Job	Run time
build-nargo	2m 24s
build-acvm-js	1m 31s
build-noirc-abi	1m 27s
build-noir-wasm	3m 25s
noirc_abi	1m 20s
ACVM JS (Browser)	1m 13s
ACVM JS (Node.js)	42s
noir_codegen	58s
Noir JS	1m 7s
Example scripts	17s
Check external repo - ${{ matrix.project.repo }}	0s
Integration Tests (Browser)	1m 51s
Integration Tests (Node)	2m 24s
noir_wasm	1m 55s
End	1s
	20m 35s

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