Revert biome rework (#38724)

* Revert "Fix world generation (#38713)"

This reverts commit 10fa6ff4af.

* Revert "Biome rework (#37735)"

This reverts commit fe7b96147c.

Content.Shared/Procedural/PostGeneration/WallMountDunGen.cs

@@ -0,0 +1,24 @@
+using Content.Shared.EntityTable;
+using Content.Shared.Maps;
+using Content.Shared.Storage;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Procedural.PostGeneration;
+
+/// <summary>
+/// Spawns on the boundary tiles of rooms.
+/// </summary>
+public sealed partial class WallMountDunGen : IDunGenLayer
+{
+    /// <summary>
+    /// Chance per free tile to spawn a wallmount.
+    /// </summary>
+    [DataField]
+    public double Prob = 0.1;
+
+    [DataField(required: true)]
+    public ProtoId<ContentTileDefinition> Tile;
+
+    [DataField(required: true)]
+    public ProtoId<EntityTablePrototype> Contents;
+}