enable EnableAlterDatabaseCreateHiveFirst feature flag

Author: ijon

ydb/core/protos/feature_flags.proto

@@ -94,7 +94,7 @@ message TFeatureFlags {
     optional bool EnableDataShardGenericReadSets = 81 [default = false];
     // enable alter database operation to create subdomain's system tablets
     // directly in subdomain's hive
-    optional bool EnableAlterDatabaseCreateHiveFirst = 82 [default = false];
+    optional bool EnableAlterDatabaseCreateHiveFirst = 82 [default = true];
     reserved 83; // EnableKqpDataQuerySourceRead
     optional bool EnableSmallDiskOptimization = 84 [default = true];
     optional bool EnableDataShardVolatileTransactions = 85 [default = false];