estimator_aid_source split GNSS pos (3d) -> pos (2d) + hgt

- per estimator air source status only keep a single set of flags and
timestamp that applies to the entire source

src/modules/ekf2/EKF/estimator_interface.h

@@ -341,8 +341,7 @@ protected:
 
 	// innovation consistency check monitoring ratios
 	AlphaFilter<float> _gnss_yaw_signed_test_ratio_lpf{0.1f}; // average signed test ratio used to detect a bias in the state
-	Vector2f _ev_vel_test_ratio{};		// EV velocity innovation consistency check ratios
-	Vector2f _ev_pos_test_ratio{};		// EV position innovation consistency check ratios
+
 	float _optflow_test_ratio{};		// Optical flow innovation consistency check ratio
 	float _hagl_test_ratio{};		// height above terrain measurement innovation consistency check ratio
 	Vector2f _drag_test_ratio{};		// drag innovation consistency check ratio