chore: prevent debugger tests from speaking to a backend #3642

Job	Run time
build-noirc-abi	14m 51s
build-acvm-js	14m 52s
build-nargo	2m 28s
noirc_abi	52s
build-noir-wasm	2m 45s
noir-js-backend-barretenberg	48s
ACVM JS (Browser)	1m 27s
Noir JS	1m 45s
ACVM JS (Node.js)	36s
noir_codegen	57s
Integration Tests (Browser)	5m 9s
noir_wasm	1m 16s
Integration Tests (Node)	5m 35s
End	1s
	53m 22s

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