Melee refactor (#10897)

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Server/Damage/Components/StaminaDamageOnHitComponent.cs

@@ -7,10 +7,4 @@ public sealed class StaminaDamageOnHitComponent : Component
 {
     [ViewVariables(VVAccess.ReadWrite), DataField("damage")]
     public float Damage = 30f;
-
-    /// <summary>
-    /// Play a sound when this knocks down an entity.
-    /// </summary>
-    [DataField("knockdownSound")]
-    public SoundSpecifier? KnockdownSound;
 }