autotest: Enabled old test and added new test on home alt reset

[Georacer]

Summary

Regarding Plane tests on Home Alt change during flight:

• Enabled old disabled test that was already passing, but was malformed.
• Created new test variant, where the altitude change occurs during stable level flight.

Details

Old test

The existing test should be passing since #24487, but it was malformed. It should be checking for the absolute altitude to be constant. The relative one is supposed to change.

New test

The new test tries to make the check a bit more explicit, by doing the Home alt change during a stable, level flight, instead of the end of the takeoff climb.

Testing

Before

The new test was passing even before #28675, as expected.
The cursor is at the moment of Home Alt change.

The TECS altitude was correctly changed:

TECS was getting reset, as expected:

The absolute altitude was roughly stable, but the TECS reset caused a dampened oscillation:

After

After #28675 TECS is shifting again:

but TECS does not reset:

and the altitude does not have a transient anymore:

[amilcarlucas]

So does this close #5672? if yes you can add that to the PR description.

[Georacer]

So does this close #5672? if yes you can add that to the PR description.

I closed this manually already, as it was not an issue anymore anyways.

[Georacer]

Apparently this fails on SetHomeAltChange, I'll have to look more carefully.