Skip EventSource tests if process is not elevated (#99261)

Author: davmason

src/libraries/System.Diagnostics.Tracing/tests/BasicEventSourceTest/Harness/EtwListener.cs

@@ -3,6 +3,7 @@
 
 using Microsoft.Diagnostics.Tracing;
 using Microsoft.Diagnostics.Tracing.Session;
+using Microsoft.DotNet.XUnitExtensions;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -39,7 +40,7 @@ public EtwListener(string dataFileName = "EventSourceTestData.etl", string sessi
             // Today you have to be Admin to turn on ETW events (anyone can write ETW events).
             if (TraceEventSession.IsElevated() != true)
             {
-                throw new Exception("Need to be elevated to run. ");
+                throw new SkipTestException("Need to be elevated to run. ");
             }
 
             if (dataFileName == null)