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/Storage/Components/EntityStorageComponent.cs

@@ -1,4 +1,5 @@
 using Content.Server.Atmos;
+using Content.Shared.Atmos;
 using Content.Shared.Storage.Components;
 using Robust.Shared.GameStates;