Add StatusCode property to GraphQueryRequestException

[jonasessen]

Problem

GraphQueryRequestException currently embeds the HTTP status code only inside the exception message string:

throw new GraphQueryRequestException($"Http error! Status code {response.StatusCode} Error: {content}", ...);

This means callers who want to handle specific HTTP errors (e.g. 401 Unauthorized vs 503 Service Unavailable) are forced to parse a string, which is fragile and not idiomatic C#.

Solution

Add a structured StatusCode property of type HttpStatusCode to GraphQueryRequestException, populated at the throw site in QueryExecutor.

Callers can now write clean, type-safe error handling:

catch (GraphQueryRequestException ex) when (ex.StatusCode == HttpStatusCode.Unauthorized)
{
    // refresh token and retry
}
catch (GraphQueryRequestException ex) when (ex.StatusCode == HttpStatusCode.ServiceUnavailable)
{
    // back off and retry
}

Changes

File	Change
GraphQueryRequestException.cs	Add HttpStatusCode StatusCode property and constructor parameter; tighten property accessors to get-only
QueryExecutor.cs	Pass response.StatusCode when throwing the exception

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