fix: don't warn on unuse global if it has an abi annotation #13968

Job	Run time
build-nargo	2m 19s
build-noirc-abi	1m 28s
build-noir-wasm	3m 28s
build-acvm-js	1m 17s
ACVM JS (Node.js)	41s
ACVM JS (Browser)	1m 26s
noirc_abi	1m 28s
Example scripts	10s
noir_codegen	59s
Noir JS	1m 19s
Check external repo - ${{ matrix.project.repo }}	0s
Integration Tests (Browser)	2m 47s
Integration Tests (Node)	2m 23s
noir_wasm	1m 47s
End	1s
	21m 33s

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