Transition from airspeed mode to non airspeed mode

[AuterionWrikeBot]

Make sure that switching between airspeed and non-airspeed mode works and is handled correctly throughout the code.
Non-airspeed mode is fully supported and already works in PX4.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

Closing as stale.

[julianoes]

FYI @RomanBapst @sfuhrer

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Thank you for your contributions.

[sfuhrer]

will test the switching while also working on #12887

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Thank you for your contributions.

[sfuhrer]

I've tested the switching form airspeed mode to non-airspeed mode, as well as the fallback to the mode where the airspeed is approximated over ground-windspeed. This switching happens automatically if the airspeed checks are enabled and a failure is detected then.
Thus closing this.