2314 Teleporting units sometimes draw their tracks between start and end position


This is new, 1821 works correctly. But there is no engine support for this, I just did stuff years ago until the tracks disappeared. Here is the current version.
```
function GG.MoveMobileUnit(unitID, tx, ty, tz)
if not CallScript(unitID, "unit_teleported", {tx, ty, tz}) then
Spring.SetUnitPosition(unitID, tx, tz)
Spring.MoveCtrl.Enable(unitID)
Spring.MoveCtrl.SetPosition(unitID, tx, ty, tz)
Spring.MoveCtrl.Disable(unitID)
end
end
```
[2024-03-18_06-00-52-841_TitanDuel 2_105.1.1-2314-g9e0bf7d BAR105.sdfz.txt](https://github.com/beyond-all-reason/spring/files/14631684/2024-03-18_06-00-52-841_TitanDuel.2_105.1.1-2314-g9e0bf7d.BAR105.sdfz.txt)

Start with GG.MoveMobileUnit and compare the current 2314 behavior with 1821. Trace the teleport path through CallScript, Spring.SetUnitPosition, and Spring.MoveCtrl, using the attached reproduction details. Done means teleporting units no longer draw tracks between their start and end positions.

Written by the indexing model from the issue text.