The config option for using `superchain-registry` style config
has been around for awhile and has been used by the devnet for
awhile. We have deprecated the usage of hh deploy style artifacts
as part of the repo and have deleted them and the code that
generates them. This PR removes the functionality of reading
hh deploy style artifacts from disk to create the L2 genesis
in `op-node`. This deletes dead code to simplify things.

Larger refactors are coming to this code path as it will wrap
forge in the future since the forge script is what will be
used to build the L2 genesis. This will ensure backwards compatibility.
Right now since the Go code builds the L2 genesis, the L2 genesis
is tied to releases of `op-node`. Once we move to foundry, then
the L2 contracts will be on their own release schedule specific
to the contracts and not the `op-node`.