The NFT bridge tests have been ported to foundry
as part of the `contracts-bedrock` package. We can
now delete the NFT bridge code from `contracts-periphery`.

Note that the `OptimismMintableERC721Factory` will be a predeploy
when upgrading to bedrock, so we do not need a deploy script for it.
Its deploy artifact was migrated to `contracts-bedrock` so that
the existing impl can be tracked. The deployment artifacts of
the `L1ERC721Bridge` and its `Proxy` were also migrated to
`contracts-bedrock`.