chore: remove warnings field from `DebugArtifact` #7258

Job	Run time
build-acvm-js	1m 35s
build-noirc-abi	2m 16s
build-noir-wasm	4m 0s
build-nargo	2m 18s
ACVM JS (Node.js)	35s
ACVM JS (Browser)	1m 16s
noirc_abi	1m 15s
noir-js-backend-barretenberg	50s
Example scripts	10s
Noir JS	1m 31s
noir_codegen	1m 8s
noir_wasm	1m 43s
Integration Tests (Browser)	5m 48s
Integration Tests (Node)	3m 46s
End	1s
	28m 12s

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