rng height: reset to baro using common logic

The failsafe from rng height to baro height should occur after a reset
to baro triggered by the controlHeightSensorTimeouts function and not in
the fusion selector.

Until now, the EKF was fusing baro measurements between rng updates if
the range finder ODR was slower than the EKF update rate. This is not
the case anymore as the height reset occurs after 5 seconds.

The unit test has been extended to show this behavior.

EKF/sensor_range_finder.cpp

@@ -64,9 +64,12 @@ void SensorRangeFinder::updateValidity(uint64_t current_time_us)
 
 	if (isSampleOutOfDate(current_time_us) || !isDataContinuous()) {
 		_is_sample_valid = false;
+		_is_regularly_sending_data = false;
 		return;
 	}
 
+	_is_regularly_sending_data = true;
+
 	// Don't run the checks unless we have retrieved new data from the buffer
 	if (_is_sample_ready) {
 		_is_sample_valid = false;