[Client bug]: MainError uses wrong naming for property InnerError

[olivermue]

Describe the bug
When Graph returns an error including an innerError, it won't be correctly deserialized. The problem is the naming of the property should be innerError and not innererror.

To Reproduce
An example response we got back from graph was:

{
  "error": {
    "code": "badRequest",
    "message": "Bad request.",
    "innerError": {
      "code": "invalidAssignmentState",
      "message": "Assignment in 'Assigned' state cannot be published.",
      "date": "2023-05-22T10:32:35",
      "request-id": "69d650fe-b1c1-4d9e-8f95-2551fb19d4c7",
      "client-request-id": "07b4f45c-e2eb-0392-8f94-d5d022c830ae"
    }
  }
}

But if you take a look at the code

        public IDictionary<string, Action<IParseNode>> GetFieldDeserializers() {
            return new Dictionary<string, Action<IParseNode>> {
                {"code", n => { Code = n.GetStringValue(); } },
                {"details", n => { Details = n.GetCollectionOfObjectValues<ErrorDetails>(ErrorDetails.CreateFromDiscriminatorValue)?.ToList(); } },
                {"innererror", n => { Innererror = n.GetObjectValue<Microsoft.Graph.Models.ODataErrors.InnerError>(Microsoft.Graph.Models.ODataErrors.InnerError.CreateFromDiscriminatorValue); } },
                {"message", n => { Message = n.GetStringValue(); } },
                {"target", n => { Target = n.GetStringValue(); } },
            };
        }

You'll see the wrong naming leading to the problem, that the property will return null instead of the filled instance.