eth/catalyst: update implementation to spec (#24802)

* eth/catalyst: return invalid payload attributes error

* eth/catalyst: implement LVH as specified, add tests

* eth/catalyst: return current block hash not header hash

* eth/catalyst: fix test

* eth/catalyst: bring error codes in line with spec

les/catalyst/api.go

@@ -161,7 +161,7 @@ func (api *ConsensusAPI) checkTerminalTotalDifficulty(head common.Hash) error {
 	}
 	td := api.les.BlockChain().GetTd(header.Hash(), header.Number.Uint64())
 	if td != nil && td.Cmp(api.les.BlockChain().Config().TerminalTotalDifficulty) < 0 {
-		return &beacon.InvalidTB
+		return errors.New("invalid ttd")
 	}
 	return nil
 }