Adding privacy event tags to each telemetry event. (#2879)

* Adding privacy event tags to each telemetry event.

* Moving Privacy events to Telemetry base, Removing tag values, and fixing namespaces.

* Adding documentation comments to fix style cop errors in release

* UTCReplace_AppSessionGuid boolean property to all C# telemetry events.

* Adding hardcoded version number to boot events.

* Adding reference to telemetry in settings unittest

* Adding Preview Pane events for loading w/ hardcoded version number

* Adding telemetry.h to msi for svg and markdown events

* removing unused explicit interface exception

src/modules/previewpane/MarkdownPreviewHandler/MarkdownPreviewHandler.cs

@@ -5,6 +5,7 @@
 using System;
 using System.Runtime.InteropServices;
 using Common;
+using Microsoft.PowerToys.Telemetry;
 
 namespace MarkdownPreviewHandler
 {
@@ -27,6 +28,7 @@ namespace MarkdownPreviewHandler
         /// <inheritdoc />
         protected override IPreviewHandlerControl CreatePreviewHandlerControl()
         {
+            PowerToysTelemetry.Log.WriteEvent(new Telemetry.Events.MarkdownFileHandlerLoaded());
             this.markdownPreviewHandlerControl = new MarkdownPreviewHandlerControl();
             return this.markdownPreviewHandlerControl;
         }