fix: do not delegate is_optimism check for Ethereum ChainSpec #12650
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is_optimism
should always be false for Ethereum'sChainSpec
, otherwise it could return true for an Ethereum chain spec if the chain id is one of Optimism's chains.This was causing hive tests to fail https://github.com/paradigmxyz/reth/actions/runs/11903470318/job/33171134482 will retrigger on this branch.