ci: add Anvil option to JS benchmark runner

[fvictorio]

Manually re-applying changes from NomicFoundation/hardhat#5150

I tried cherry-picking them, but it was causing me a lot of issues, I'm not sure why.

[Wodann]

LGTM, but I'll cede to Franco for a final review

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Latest commit: 38aa2c3

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[fvictorio]

I don't think the @foundry-rs/hardhat-anvil part is necessary if we are starting anvil manually? I removed it in 38aa2c3 and tried it and worked fine without it. And I'd rather not use that dependency (it's a bit of ahack, and I'm not sure it's maintained).

But if I'm missing something here, feel free to revert that commit.

[agostbiro]

@fvictorio yeah @foundry-rs/hardhat-anvil it's not needed anymore, thanks for removing!