fix(baseapp): preblock events are not emmitted correctly (backport #21444) (#21457)

Co-authored-by: Facundo Medica <14063057+facundomedica@users.noreply.github.com>

baseapp/baseapp.go

@@ -706,7 +706,7 @@ func (app *BaseApp) cacheTxContext(ctx sdk.Context, txBytes []byte) (sdk.Context
 func (app *BaseApp) preBlock(req *abci.FinalizeBlockRequest) ([]abci.Event, error) {
 	var events []abci.Event
 	if app.preBlocker != nil {
-		ctx := app.finalizeBlockState.Context()
+		ctx := app.finalizeBlockState.Context().WithEventManager(sdk.NewEventManager())
 		if err := app.preBlocker(ctx, req); err != nil {
 			return nil, err
 		}

types/module/module.go

@@ -714,7 +714,6 @@ func (m Manager) RunMigrations(ctx context.Context, cfg Configurator, fromVM app
 // It takes the current context as a parameter and returns a boolean value
 // indicating whether the migration was successfully executed or not.
 func (m *Manager) PreBlock(ctx sdk.Context) error {
-	ctx = ctx.WithEventManager(sdk.NewEventManager())
 	for _, moduleName := range m.OrderPreBlockers {
 		if module, ok := m.Modules[moduleName].(appmodule.HasPreBlocker); ok {
 			if err := module.PreBlock(ctx); err != nil {