feat: replace the cosmos-db.DB interface with core/store interface (backport #21450) (#21490)

Co-authored-by: Julien Robert <julien@rbrt.fr>

testutil/sims/app_helpers.go

@@ -12,6 +12,7 @@ import (
 	dbm "github.com/cosmos/cosmos-db"
 
 	coreheader "cosmossdk.io/core/header"
+	corestore "cosmossdk.io/core/store"
 	"cosmossdk.io/depinject"
 	sdkmath "cosmossdk.io/math"
 	banktypes "cosmossdk.io/x/bank/types"
@@ -83,7 +84,7 @@ type StartupConfig struct {
 	BaseAppOption   runtime.BaseAppOption
 	AtGenesis       bool
 	GenesisAccounts []GenesisAccount
-	DB              dbm.DB
+	DB              corestore.KVStoreWithBatch
 }
 
 func DefaultStartUpConfig() StartupConfig {

testutil/sims/simulation_helpers.go

@@ -9,6 +9,7 @@ import (
 
 	dbm "github.com/cosmos/cosmos-db"
 
+	corestore "cosmossdk.io/core/store"
 	"cosmossdk.io/log"
 	storetypes "cosmossdk.io/store/types"
 
@@ -24,7 +25,7 @@ import (
 // SetupSimulation creates the config, db (levelDB), temporary directory and logger for the simulation tests.
 // If `skip` is false it skips the current test. `skip` should be set using the `FlagEnabledValue` flag.
 // Returns error on an invalid db instantiation or temp dir creation.
-func SetupSimulation(config simtypes.Config, dirPrefix, dbName string, verbose, skip bool) (dbm.DB, string, log.Logger, bool, error) {
+func SetupSimulation(config simtypes.Config, dirPrefix, dbName string, verbose, skip bool) (corestore.KVStoreWithBatch, string, log.Logger, bool, error) {
 	if !skip {
 		return nil, "", nil, true, nil
 	}