Revert 'Revert 'Solution Entities'' (#23168)

Content.Server/Atmos/Piping/Unary/Components/GasCondenserComponent.cs

@@ -1,4 +1,5 @@
 using Content.Server.Atmos.Piping.Unary.EntitySystems;
+using Content.Shared.Chemistry.Components;
 
 namespace Content.Server.Atmos.Piping.Unary.Components;
 
@@ -21,6 +22,12 @@ public sealed partial class GasCondenserComponent : Component
     [DataField]
     public string SolutionId = "tank";
 
+    /// <summary>
+    /// The solution that gases are condensed into.
+    /// </summary>
+    [DataField]
+    public Entity<SolutionComponent>? Solution = null;
+
     /// <summary>
     /// For a condenser, how many U of reagents are given per each mole of gas.
     /// </summary>