chore: ignore almost-empty directories in nargo_cli tests #15636

Job	Run time
build-nargo	2m 30s
build-noirc-abi	1m 27s
build-noir-wasm	3m 37s
build-acvm-js	1m 30s
noirc_abi	1m 25s
ACVM JS (Node.js)	46s
ACVM JS (Browser)	1m 18s
Noir JS	1m 2s
noir_codegen	1m 6s
Example scripts	12s
Check external repo - ${{ matrix.project.repo }}	0s
Integration Tests (Node)	2m 15s
Integration Tests (Browser)	1m 49s
noir_wasm	1m 56s
End	1s
	20m 54s

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