Replace EventWrittenEventArgs.EmptyPayload with ReadOnlyCollection.Empty singleton (#87906)

src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs

@@ -2077,7 +2077,7 @@ private unsafe void WriteToAllListeners(EventWrittenEventArgs eventCallbackArgs,
             object?[] args;
             if (eventDataCount == 0)
             {
-                eventCallbackArgs.Payload = EventWrittenEventArgs.EmptyPayload;
+                eventCallbackArgs.Payload = ReadOnlyCollection<object?>.Empty;
             }
             else
             {
@@ -4675,8 +4675,6 @@ public class EventSourceCreatedEventArgs : EventArgs
     /// </summary>
     public class EventWrittenEventArgs : EventArgs
     {
-        internal static readonly ReadOnlyCollection<object?> EmptyPayload = new(Array.Empty<object>());
-
         private ref EventSource.EventMetadata Metadata => ref EventSource.m_eventData![EventId];
 
         /// <summary>