fix: Fix remaining issues in Brillig's copy on write arrays #2703

Job	Run time
build-acvm-js	3m 6s
build-nargo (x86_64-unknown-linux-gnu)	2m 5s
build-noirc	3m 38s
build-wasm	4m 58s
test-solidity-verifier	5m 1s
	18m 48s

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