Disable YQL whole-graph block propagation

Author: abyss7

ydb/core/kqp/opt/kqp_opt_build_txs.cpp

@@ -578,7 +578,6 @@ class TKqpBuildTxsTransformer : public TSyncTransformerBase {
             .Add(*TypeAnnTransformer, "TypeAnnotation")
             .AddPostTypeAnnotation(/* forSubgraph */ true)
             .Add(CreateKqpBuildPhyStagesTransformer(enableSpillingGenericQuery, typesCtx, config->BlockChannelsMode), "BuildPhysicalStages")
-            .Add(CreateKqpBuildWideBlockChannelsTransformer(typesCtx, config->BlockChannelsMode), "BuildWideBlockChannels")
             .Add(*BuildTxTransformer, "BuildPhysicalTx")
             .Add(CreateKqpTxPeepholeTransformer(
                 TypeAnnTransformer.Get(), typesCtx, config,