fix memory leak (#18578)

Co-authored-by: ivanmorozov333 <imorozov333@ya.ru>

Author: ivanmorozov333

ydb/core/tx/columnshard/engines/changes/abstract/abstract.h

@@ -299,7 +299,7 @@ class TColumnEngineChanges: public TMoveOnly {
         ActivityFlag = flag;
     }
 
-    std::shared_ptr<TDataAccessorsRequest> ExtractDataAccessorsRequest() const {
+    std::shared_ptr<TDataAccessorsRequest> ExtractDataAccessorsRequest() {
         AFL_VERIFY(!!PortionsToAccess);
         return std::move(PortionsToAccess);
     }

ydb/core/tx/columnshard/engines/ut/ut_logs_engine.cpp

@@ -388,7 +388,7 @@ bool Compact(TColumnEngineForLogs& engine, TTestDbWrapper& db, TSnapshot snap, N
         auto request = changes->ExtractDataAccessorsRequest();
         request->RegisterSubscriber(
             std::make_shared<TTestCompactionAccessorsSubscriber>(changes, std::make_shared<NOlap::TVersionedIndex>(engine.GetVersionedIndex())));
-        engine.FetchDataAccessors(changes->ExtractDataAccessorsRequest());
+        engine.FetchDataAccessors(request);
     }
     changes->Blobs = std::move(blobs);
     NOlap::TConstructionContext context(engine.GetVersionedIndex(), NColumnShard::TIndexationCounters("Compaction"), NOlap::TSnapshot(step, 1));
@@ -478,7 +478,7 @@ bool Ttl(TColumnEngineForLogs& engine, TTestDbWrapper& db, const THashMap<TInter
         auto request = changes->ExtractDataAccessorsRequest();
         request->RegisterSubscriber(
             std::make_shared<TTestCompactionAccessorsSubscriber>(changes, std::make_shared<NOlap::TVersionedIndex>(engine.GetVersionedIndex())));
-        engine.FetchDataAccessors(changes->ExtractDataAccessorsRequest());
+        engine.FetchDataAccessors(request);
     }
     const bool result = engine.ApplyChangesOnTxCreate(changes, TSnapshot(1, 1)) && engine.ApplyChangesOnExecute(db, changes, TSnapshot(1, 1));
     NOlap::TWriteIndexContext contextExecute(nullptr, db, engine, TSnapshot(1, 1));