chore: Move independent `run_test` function into nargo core #878

Job	Run time
build-barretenberg	26s
build-linux (x86_64-unknown-linux-gnu)	12m 56s
build-linux (x86_64-unknown-linux-musl)	11m 26s
build-linux (aarch64-unknown-linux-gnu)	11m 22s
build-linux (aarch64-unknown-linux-musl)	11m 24s
build-apple-darwin (x86_64-apple-darwin)	6m 56s
build-apple-darwin (aarch64-apple-darwin)	6m 0s
build-windows (x86_64-pc-windows-msvc)	6m 45s
	1h 7m 15s

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