adding in stylecop goodness (#5301)

Co-authored-by: Clint Rutkas <crutkas@microsoft.com>

src/common/ManagedTelemetry/Telemetry/Events/IEvent.cs

@@ -1,6 +1,6 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
 
 namespace Microsoft.PowerToys.Telemetry.Events
 {