Update TESTOWNERS (#14391)

.github/TESTOWNERS

@@ -18,6 +18,7 @@
 #Column Tables Development Team @zverevgeny TEAM:@ydb-platform/cs
 /ydb/core/tx/columnshard @ydb-platform/cs
 /ydb/tests/olap @ydb-platform/cs
+/ydb/core/kqp/ut/olap @ydb-platform/cs
 
 #Distributed System Infrastructure Team @ijon TEAM:@ydb-platform/system-infra
 /ydb/core/mind/hive @ydb-platform/system-infra