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/CornerClutterDunGen.cs

@@ -0,0 +1,17 @@
+using Content.Shared.EntityTable;
+using Content.Shared.Storage;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Procedural.PostGeneration;
+
+/// <summary>
+/// Spawns entities inside corners.
+/// </summary>
+public sealed partial class CornerClutterDunGen : IDunGenLayer
+{
+    [DataField]
+    public float Chance = 0.50f;
+
+    [DataField(required:true)]
+    public ProtoId<EntityTablePrototype> Contents = new();
+}