ekf2: EV overhaul yaw and position fusion (#20501)

- move EV yaw and EV position to new state machines
 - EV yaw and EV pos now configured via EKF2_EV_CTRL (migrated from EKF2_AID_MASK)
 - new EV position offset estimator to enable EV position while GPS position is active (no more EV pos delta fusion)
 - yaw_align now strictly means north (no more rotate external vision aid mask)
 - automatic switching between EV yaw, and yaw align north based on GPS quality

src/modules/ekf2/EKF/fake_pos_control.cpp

@@ -95,7 +95,6 @@ void Ekf::controlFakePosFusion()
 			if (starting_conditions_passing) {
 				ECL_INFO("start fake position fusion");
 				_control_status.flags.fake_pos = true;
-				_fuse_hpos_as_odom = false; // TODO: needed?
 				resetFakePosFusion();
 
 				if (_control_status.flags.tilt_align) {