feat: replace the cosmos-db usecases in the tests with core/testing (backport #21525) (#21720)

Co-authored-by: cool-developer <51834436+cool-develope@users.noreply.github.com>
Co-authored-by: Julien Robert <julien@rbrt.fr>

server/mock/app.go

@@ -8,7 +8,7 @@ import (
 	"path/filepath"
 
 	abci "github.com/cometbft/cometbft/api/cometbft/abci/v1"
-	db "github.com/cosmos/cosmos-db"
+	dbm "github.com/cosmos/cosmos-db"
 	"google.golang.org/grpc"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/reflect/protodesc"
@@ -30,7 +30,7 @@ import (
 // similar to a real app. Make sure rootDir is empty before running the test,
 // in order to guarantee consistent results.
 func NewApp(rootDir string, logger log.Logger) (servertypes.ABCI, error) {
-	db, err := db.NewGoLevelDB("mock", filepath.Join(rootDir, "data"), nil)
+	db, err := dbm.NewGoLevelDB("mock", filepath.Join(rootDir, "data"), nil)
 	if err != nil {
 		return nil, err
 	}

server/mock/store_test.go

@@ -3,14 +3,14 @@ package mock
 import (
 	"testing"
 
-	dbm "github.com/cosmos/cosmos-db"
 	"github.com/stretchr/testify/require"
 
+	coretesting "cosmossdk.io/core/testing"
 	storetypes "cosmossdk.io/store/types"
 )
 
 func TestStore(t *testing.T) {
-	db := dbm.NewMemDB()
+	db := coretesting.NewMemDB()
 
 	cms := NewCommitMultiStore()