message: Use local read concern in transaction test checks
diff: @@ -365,6 +365,11 @@ void check_outcome_collection(mongocxx::collection* coll, bsoncxx::document::vie
  std::vector<std::string> actual_data;
  std::vector<std::string> expected_data;
  + read_concern rc;
  + rc.acknowledge_level(read_concern::level::k_local);
  + auto old_rc = coll->read_concern();
  + coll->read_concern(rc);
  +
  options::find options{};
  builder::basic::document sort{};
  sort.append(builder::basic::kvp("_id", 1));
  @@ -379,6 +384,8 @@ void check_outcome_collection(mongocxx::collection* coll, bsoncxx::document::vie
  }
  REQUIRE(expected_data == actual_data);
  +
  + coll->read_concern(old_rc);
  }
  bool server_has_sessions(const client& conn) {
  