De-duplicate loadout gear (#30341)

* De-duplicate loadout gear

Needs supporting code, probably with an interface with StartingGearPrototype which would also use it, but I regexed the yaml.

* Code updates

* Remaining yaml

* Fix automatic naming

* raiseEvent

* Don't code when tired kids

Content.Server/Administration/Commands/SetOutfitCommand.cs

@@ -97,11 +97,12 @@ namespace Content.Server.Administration.Commands
                 foreach (var slot in slots)
                 {
                     invSystem.TryUnequip(target, slot.Name, true, true, false, inventoryComponent);
-                    var gearStr = startingGear.GetGear(slot.Name);
+                    var gearStr = ((IEquipmentLoadout) startingGear).GetGear(slot.Name);
                     if (gearStr == string.Empty)
                     {
                         continue;
                     }
+
                     var equipmentEntity = entityManager.SpawnEntity(gearStr, entityManager.GetComponent<TransformComponent>(target).Coordinates);
                     if (slot.Name == "id" &&
                         entityManager.TryGetComponent(equipmentEntity, out PdaComponent? pdaComponent) &&