remove einterface gets (#7455)

utils/config.go

@@ -689,11 +689,3 @@ func Desanitize(cfg *model.Config) {
 		cfg.SqlSettings.DataSourceSearchReplicas[i] = Cfg.SqlSettings.DataSourceSearchReplicas[i]
 	}
 }
-
-func IsLeader() bool {
-	if IsLicensed() && *Cfg.ClusterSettings.Enable && einterfaces.GetClusterInterface() != nil {
-		return einterfaces.GetClusterInterface().IsLeader()
-	} else {
-		return true
-	}
-}