host.json: Ignore comments and trailing commas

see https://github.com/Azure/azure-functions-host/issues/9583

extensions/Worker.Extensions.Http.AspNetCore/src/AspNetMiddleware/FunctionsEndpointDataSource.cs

@@ -22,7 +22,9 @@ internal class FunctionsEndpointDataSource : EndpointDataSource
 
         private static readonly JsonSerializerOptions _jsonSerializerOptions = new()
         {
-            PropertyNameCaseInsensitive = true
+            AllowTrailingCommas = true,
+            PropertyNameCaseInsensitive = true,
+            ReadCommentHandling = JsonCommentHandling.Skip,
         };