Zombie Rework & Polymorph Expansion (#8413)

Co-authored-by: Kara <lunarautomaton6@gmail.com>
Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Server/Zombies/ZombieComponent.cs

@@ -0,0 +1,12 @@
+namespace Content.Server.Zombies
+{
+    [RegisterComponent]
+    public sealed class ZombieComponent : Component
+    {
+        /// <summary>
+        /// The coefficient of the damage reduction applied when a zombie
+        /// attacks another zombie. longe name
+        /// </summary>
+        public float OtherZombieDamageCoefficient = 0.75f;
+    }
+}