Add delay to File System watchers to prevent Calibre installation issue (#6821)

* add a separate task to dequeue and create an app on installation

* Added tests to validate the behavior of the event handler

* release unmanaged memory

src/modules/launcher/Plugins/Microsoft.Plugin.Program/Programs/ShellLinkHelper.cs

@@ -174,6 +174,9 @@ namespace Microsoft.Plugin.Program.Programs
                 }
             }
 
+            // To release unmanaged memory
+            Marshal.ReleaseComObject(link);
+
             return target;
         }
     }