[Tests][NativeAOT] UserEvents Tests failing to discover Record-Trace path

[mdh1418]

11:31:58.741 Running test: tracing/userevents/custommetadata/custommetadata/custommetadata.cmd
Unhandled exception. System.ArgumentNullException: Value cannot be null. (Parameter 'path1')
   at System.ArgumentNullException.Throw(String)
   at System.IO.Path.Combine(String, String, String)
   at Tracing.UserEvents.Tests.Common.UserEventsTestRunner.ResolveRecordTracePath(String)
   at Tracing.UserEvents.Tests.Common.UserEventsTestRunner.RunOrchestrator(String, String, Func`2, Int32, Int32)
   at Tracing.UserEvents.Tests.CustomMetadata.CustomMetadata.Main(String[] args)

From #123541.