remove op Genesis conversions from reth-chainspec

[mattsse]

we still have

reth/crates/chainspec/src/spec.rs

Lines 591 to 603 in 9c9b1fd

	impl From<Genesis> for ChainSpec {
	fn from(genesis: Genesis) -> Self {
	#[cfg(not(feature = "optimism"))]
	{
	into_ethereum_chain_spec(genesis)
	}
	#[cfg(feature = "optimism")]
	{
	into_optimism_chain_spec(genesis)
	}
	}
	}

now that we have chainspec abstracted we can remove this conversion and replace with standalone op function which is used:

reth/crates/optimism/cli/src/chainspec.rs

Line 20 in 9c9b1fd

_ => Arc::new(OpChainSpec { inner: parse_custom_chain_spec(s)? }),

TODO

• extract optimism specific From Genesis to optimism chainspec

we likely should do #11397 first, or maybe we need to this in one go

cc @greged93

[greged93]

will tal!