[New Feature] New key to disallow Mobile Repair Vehicles from repairing a deployed unit

[Bittah]

First Check

• [X] I added a very descriptive title to this issue.
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Description

The only key that prevents a Mobile Repair Vehicle from repairing a structure that has the UndeploysInto= key is ConstructionYard=yes, but since this key has other side-effects we need a different key for this.

Proposed Code (optional)

RepairableByUnit=

Additional Context

No response

[FS-21]

Just play with Ares armors & warheads.