Don't order transports for incapable factions.

If these orders can't be fulfilled for the faction it will prevent the
faction from ordering any non-reserve aircraft since transports are
given priority after reserve missions, and they'll never be fulfillable.
As such, no non-reserve aircraft will ever be purchased for factions
without transport aircraft.

Factions without transport aircraft are screwed in other ways, but this
will fix their air planning for campaigns that aren't dependent on
airlift.

(cherry picked from commit e96210f48c)

gen/flights/ai_flight_planner.py

@@ -604,14 +604,7 @@ class CoalitionMissionPlanner:
         also possible for the player to exclude mission types from their squadron
         designs.
         """
-        all_compatible = aircraft_for_task(mission_type)
-        for squadron in self.game.air_wing_for(self.is_player).iter_squadrons():
-            if (
-                squadron.aircraft in all_compatible
-                and mission_type in squadron.auto_assignable_mission_types
-            ):
-                return True
-        return False
+        return self.game.air_wing_for(self.is_player).can_auto_plan(mission_type)
 
     def critical_missions(self) -> Iterator[ProposedMission]:
         """Identifies the most important missions to plan this turn.