Fix evm duplicated dependency

[Dinonard]

Pull Request Summary

Makes evm dependency in precompile-utils optional.

Moved the only function that relies on that crate to testing.rs since it's only used there. This should help avoid using different evm versions in the future for production code.

[github-actions[bot]]

Package	Line Rate	Branch Rate	Health
chain-extensions/impls/dapps-staking/src	0%	0%	❌
frame/custom-signatures/src	81%	0%	✔
precompiles/assets-erc20/src	91%	0%	✔
frame/pallet-xcm/src	81%	0%	✔
frame/vesting/src	87%	0%	✔
precompiles/utils/macro/tests	100%	0%	✔
primitives/xcm/src	88%	0%	✔
precompiles/utils/src/data	72%	0%	➖
frame/block-reward/src	96%	0%	✔
precompiles/substrate-ecdsa/src	78%	0%	➖
frame/xc-asset-config/src	88%	0%	✔
chain-extensions/types/dapps-staking/src	0%	0%	❌
frame/dapps-staking/src	93%	0%	✔
precompiles/dapps-staking/src	95%	0%	✔
frame/collator-selection/src	89%	0%	✔
precompiles/utils/macro/src	0%	0%	❌
precompiles/utils/src	84%	0%	✔
precompiles/sr25519/src	78%	0%	➖
precompiles/xcm/src	80%	0%	➖
frame/dapps-staking/src/pallet	85%	0%	✔
chain-extensions/trait/src	0%	0%	❌
Summary	86% (8338 / 9725)	0% (0 / 0)	✔

Minimum allowed line rate is 60%