Revert biome rework (#38724)

* Revert "Fix world generation (#38713)"

This reverts commit 10fa6ff4af.

* Revert "Biome rework (#37735)"

This reverts commit fe7b96147c.

Content.Shared/Procedural/Loot/BiomeTemplateLoot.cs

@@ -0,0 +1,14 @@
+using Content.Shared.Parallax.Biomes;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Shared.Procedural.Loot;
+
+/// <summary>
+/// Adds a biome template layer for dungeon loot.
+/// </summary>
+public sealed partial class BiomeTemplateLoot : IDungeonLoot
+{
+    [DataField("proto", required: true)]
+    public ProtoId<BiomeTemplatePrototype> Prototype = string.Empty;
+}