dedupe forge artifact structs

There are a bunch of redundant structs/types in op-chain-ops/foundry and op-chain-ops/solc (e.g. [Artifact](https://github.com/ethereum-optimism/optimism/blob/develop/op-chain-ops/foundry/artifact.go#L20-L27) and [ForgeArtifact](https://github.com/ethereum-optimism/optimism/blob/develop/op-chain-ops/solc/types.go#L267-L277)).

These can be deduped. The `solc` ones are more accurate and in-depth, so they should remain and the `foundry` ones should be removed

Start by comparing op-chain-ops/foundry/artifact.go and op-chain-ops/solc/types.go, especially Artifact and ForgeArtifact, then search the repository for uses of the foundry types. Done means the redundant foundry artifact structs are no longer needed, affected references use the solc definitions, and the affected Go packages still build and test successfully.

Written by the indexing model from the issue text.