Reduce vendor thank you message spam and add variety (#23746)

* Moved vendor thank you messages into AdvertisementPack, making them vendor-specific.
Wrote a few example messages.

* Only display thank yous when closing the UI after a purchase.

* Tweaked a few messages

* More custom messages

* Missed one

Content.Shared/VendingMachines/VendingMachineComponent.cs

@@ -51,6 +51,8 @@ namespace Content.Shared.VendingMachines
 
         public bool Broken;
 
+        public bool ShouldSayThankYou;
+
         /// <summary>
         /// When true, will forcefully throw any object it dispenses
         /// </summary>