Use archived gas mixture in gas exchange comparison (#32088)

The comparison for doing gas exchange used current and not archived
moles. This could lead to update order-dependent gas spreading effects.

To fix this, convert TileAtmosphere's MolesArchived and
TemperatureArchived to a AirArchived, and use that in the comparison
method.

---------

Co-authored-by: PraxisMapper <praxismapper@gmail.com>
Co-authored-by: Kevin Zheng <kevinz5000@gmail.com>

Content.Server/Atmos/EntitySystems/AtmosphereSystem.Gases.cs

@@ -281,6 +281,17 @@ namespace Content.Server.Atmos.EntitySystems
             return true;
         }
 
+        /// <summary>
+        ///     Compares two TileAtmospheres to see if they are within acceptable ranges for group processing to be enabled.
+        /// </summary>
+        public GasCompareResult CompareExchange(TileAtmosphere sample, TileAtmosphere otherSample)
+        {
+            if (sample.AirArchived == null || otherSample.AirArchived == null)
+                return GasCompareResult.NoExchange;
+
+            return CompareExchange(sample.AirArchived, otherSample.AirArchived);
+        }
+
         /// <summary>
         ///     Compares two gas mixtures to see if they are within acceptable ranges for group processing to be enabled.
         /// </summary>