Interop: stop finalizing blocks using old deriver, use superchain backend instead

[protolambda]

Stop finalizing blocks post-interop based on L1 local finality, use the superchain backend (op-supervisor finality endpoint) instead.

Add something to the finality deriver like:

      //if !fi.cfg.IsInterop(fi.cfg.TimestampForBlock(l2Safe.Number)) {
      //      return nil
      //}