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[Petra] update usage of Elephant class

Description

[Petra] update usage of Elephant class

Remove Champion class from siege functions related to melee elephants.
Improve mobile dropsite code by replacing Elephant class with Unit class.
Remove code related to fact support elephants can build as it is not case anymore.

Differential Revision: https://code.wildfiregames.com/D2964
Patch by: Nescio
Reviewed by: Angen