chore: remove dependency on generational-arena #4107

Job	Run time
build-noirc-abi	2m 39s
build-noir-wasm	2m 51s
build-acvm-js	2m 33s
build-nargo	2m 38s
ACVM JS (Node.js)	31s
ACVM JS (Browser)	1m 38s
noirc_abi	37s
noir-js-backend-barretenberg	47s
noir_codegen	58s
Noir JS	1m 28s
Integration Tests (Browser)	5m 18s
Integration Tests (Node)	5m 27s
noir_wasm	1m 3s
End	1s
	28m 29s

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