Add gatherable break sounds (#19360)

Content.Shared/Audio/SharedContentAudioSystem.cs

@@ -6,6 +6,11 @@ public abstract class SharedContentAudioSystem : EntitySystem
 {
     [Dependency] private readonly SharedAudioSystem _audio = default!;
 
+    /// <summary>
+    /// Standard variation to use for sounds.
+    /// </summary>
+    public const float DefaultVariation = 0.05f;
+
     public override void Initialize()
     {
         base.Initialize();