chore(CI): remove nix from CI #3665

Job	Run time
build-nargo	2m 44s
build-nargo	2m 44s
build-noirc-abi	2m 48s
build-noirc-abi	2m 48s
build-noir-wasm	2m 27s
build-noir-wasm	2m 27s
build-acvm-js	2m 30s
build-acvm-js	2m 30s
ACVM JS (Node.js)	42s
ACVM JS (Node.js)	42s
ACVM JS (Browser)	1m 56s
ACVM JS (Browser)	1m 35s
noir_wasm	1m 8s
noir_wasm	1m 8s
Noir JS	1m 38s
Noir JS	1m 38s
Integration Tests (Browser)	5m 17s
Integration Tests (Browser)	5m 17s
Integration Tests (Node)	5m 30s
Integration Tests (Node)	5m 30s
noirc_abi	43s
noirc_abi	43s
noir_codegen	1m 0s
noir_codegen	1m 0s
noir-js-backend-barretenberg	47s
noir-js-backend-barretenberg	47s
End	1s
End	1s
	58m 1s

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