Include Event Source Name in EventLog Event Log entries

[bobsira]

With this change Event Log now has the EventSource entry. Observe the example log emitted with this change.

{
  "Source": "EventLog",
  "LogEntry": {
    "EventSource": ".NET Runtime",
    "Time": "2024-05-15T23:53:41.000Z",
    "Channel": "Application",
    "Level": "Error",
    "EventId": 1026,
    "Message": "Application: VSUpdateHelper.exe\nFramework Version: v4.0.30319\nDescription: The process was terminated due to an unhandled exception.\nException Info: System.Runtime.InteropServices.COMException\n   at Microsoft.VisualStudio.Setup.Services.ProcessService.GetShellDispatchForLoggedInUser()\n   at Microsoft.VisualStudio.Setup.Services.ProcessService.RunAsLoggedOnUser(System.String, System.String)\n   at Microsoft.VisualStudio.Setup.VSUpdateHelper.ToastService.StartProcess(Microsoft.VisualStudio.Setup.ToastNotifications.ToastMessageType)\n   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)\n   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)\n   at System.Threading.TimerQueueTimer.CallCallback()\n   at System.Threading.TimerQueueTimer.Fire()\n   at System.Threading.TimerQueue.FireNextTimers()\n\n"
  }
}