Move GasMixture to shared (#27480)

* Moved GasMixture to shared

* Temp Fix for sandbox violation, idk why Array.Resize isn't working properly. It's already sandboxed.

* The most powerful webedit in history

Content.Server/Nutrition/EntitySystems/SmokingSystem.Vape.cs

@@ -13,6 +13,7 @@ using Content.Shared.IdentityManagement;
 using Content.Shared.Interaction;
 using Content.Shared.Nutrition;
 using System.Threading;
+using Content.Shared.Atmos;
 
 /// <summary>
 /// System for vapes