remove HeaderFilter.cs, no longer needed

csharp/App/Backend/HeaderFilter.cs

@@ -1,24 +0,0 @@
-using Microsoft.OpenApi.Models;
-using Swashbuckle.AspNetCore.SwaggerGen;
-
-namespace InnovEnergy.App.Backend;
-
-/// <summary>
-/// This is for convenient testing! Todo throw me out?
-/// Operation filter to add the requirement of the custom header
-/// </summary>
-public class HeaderFilter : IOperationFilter
-{
-    public void Apply(OpenApiOperation operation, OperationFilterContext context)
-    {
-        operation.Parameters ??= new List<OpenApiParameter>();
-
-        operation.Parameters.Add(new OpenApiParameter
-        {
-            Name = "auth",
-            In =  ParameterLocation.Header,
-            Content = new Dictionary<String, OpenApiMediaType>(),
-            Required = false
-        });
-    }
-}