WIP: Plane: Reset TECS along with the rest of the controllers

[Georacer]

For the balloon drop use-case, I've noticed that TECS would initialize on the ground. That meant that the desired altitude (which is under an LPF) would not start close to the actual altitude, rendering itself useless for an RTL:

With this commit TECS starts at the release altitude, resulting in reasonable altitude error:

Don't mind the TECS commit, it will be covered by https://github.com/ArduPilot/ardupilot/pull/27758 .