op-chain-ops: delete unused check script

Delete an unused check script from `op-chain-ops`. This script was
added as a sanity check for the migration but it ended up not being
necessary. It can be removed as it will never be used again.

op-chain-ops/cmd/check-migration-quick/main.go

-package main
-
-import (
-	"bytes"
-	"fmt"
-	"os"
-
-	"github.com/mattn/go-isatty"
-	"github.com/urfave/cli"
-
-	"github.com/ethereum-optimism/optimism/op-chain-ops/db"
-	"github.com/ethereum-optimism/optimism/op-chain-ops/genesis"
-	"github.com/ethereum/go-ethereum/common/hexutil"
-	"github.com/ethereum/go-ethereum/core/rawdb"
-	"github.com/ethereum/go-ethereum/log"
-)
-
-func main() {
-	log.Root().SetHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(isatty.IsTerminal(os.Stderr.Fd()))))
-
-	app := &cli.App{
-		Name:  "check-migration-quick",
-		Usage: "Quick check for a migrated database that only checks the header magic in the extradata",
-		Flags: []cli.Flag{
-			&cli.StringFlag{
-				Name:     "db-path",
-				Usage:    "Path to database",
-				Required: true,
-			},
-			&cli.IntFlag{
-				Name:  "db-cache",
-				Usage: "LevelDB cache size in mb",
-				Value: 1024,
-			},
-			&cli.IntFlag{
-				Name:  "db-handles",
-				Usage: "LevelDB number of handles",
-				Value: 60,
-			},
-		},
-		Action: func(ctx *cli.Context) error {
-			dbCache := ctx.Int("db-cache")
-			dbHandles := ctx.Int("db-handles")
-
-			ldb, err := db.Open(ctx.String("db-path"), dbCache, dbHandles)
-			if err != nil {
-				return err
-			}
-
-			hash := rawdb.ReadHeadHeaderHash(ldb)
-			log.Info("Reading chain tip from database", "hash", hash)
-			num := rawdb.ReadHeaderNumber(ldb, hash)
-			if num == nil {
-				return fmt.Errorf("cannot find header number for %s", hash)
-			}
-
-			header := rawdb.ReadHeader(ldb, hash, *num)
-			log.Info("Read header from database", "number", *num)
-
-			log.Info(
-				"Header info",
-				"parentHash", header.ParentHash.Hex(),
-				"root", header.Root.Hex(),
-				"number", header.Number,
-				"gasLimit", header.GasLimit,
-				"time", header.Time,
-				"extra", hexutil.Encode(header.Extra),
-			)
-
-			if !bytes.Equal(header.Extra, genesis.BedrockTransitionBlockExtraData) {
-				return fmt.Errorf("expected extra data to be %x, but got %x", genesis.BedrockTransitionBlockExtraData, header.Extra)
-			}
-
-			if err := ldb.Close(); err != nil {
-				return err
-			}
-
-			return nil
-		},
-	}
-
-	if err := app.Run(os.Args); err != nil {
-		log.Crit("error in migration", "err", err)
-	}
-}