Disable volatile transactions KIKIMR-21060

Author: snaury

ydb/core/protos/feature_flags.proto

@@ -97,7 +97,7 @@ message TFeatureFlags {
     optional bool EnableAlterDatabaseCreateHiveFirst = 82 [default = false];
     reserved 83; // EnableKqpDataQuerySourceRead
     optional bool EnableSmallDiskOptimization = 84 [default = true];
-    optional bool EnableDataShardVolatileTransactions = 85 [default = true];
+    optional bool EnableDataShardVolatileTransactions = 85 [default = false];
     optional bool EnableTopicServiceTx = 86 [default = false];
     optional bool EnableLLVMCache = 87 [default = false];
     optional bool EnableExternalDataSources = 88 [default = false];