Merge "Make testHeartBeatEvent more stable." into main

    std::this_thread::sleep_for(std::chrono::seconds(3));

    auto maybeResults = getCallback()->nextOnPropertyEventResults();

    size_t retryCount = 0;

    // Add a 1s (100ms * 10) buffer time.

    while (!maybeResults.has_value() && retryCount < 10) {

        retryCount++;

        std::this_thread::sleep_for(std::chrono::milliseconds(100));

    }

    ASSERT_TRUE(maybeResults.has_value()) << "no results in callback";

    ASSERT_EQ(maybeResults.value().payloads.size(), static_cast<size_t>(1));

    VehiclePropValue gotValue = maybeResults.value().payloads[0];