Make vending machine restocks predicted (and its sound not spammable) (#38609)

* feat: make vending machine restocks predicted

* refactor: VendingMachineRestockComponent cleanup

* refactor: minor simplification

* revert: refactor: minor simplification; load bearing IsFirstTimePredicted

lol second guessed myself

* chore: unneeded VendingMachineSystem dep

* Update Content.Shared/VendingMachines/VendingMachineComponent.cs

---------

Co-authored-by: slarticodefast <161409025+slarticodefast@users.noreply.github.com>

Content.Shared/VendingMachines/VendingMachineComponent.cs

@@ -139,6 +139,12 @@ namespace Content.Shared.VendingMachines
         [DataField(customTypeSerializer: typeof(TimeOffsetSerializer))]
         public TimeSpan NextEmpEject = TimeSpan.Zero;
 
+        /// <summary>
+        /// Audio entity used during restock in case the doafter gets canceled.
+        /// </summary>
+        [DataField]
+        public EntityUid? RestockStream;
+
         #region Client Visuals
         /// <summary>
         /// RSI state for when the vending machine is unpowered.