Fix route not going over edges that are very short

[DavidKarlas]

I know this is a bit hacky, but feel free to propose better solution :)
Here is code on how to find such edges:

using var ms = new MemoryStream();
using var jsonWriter = new Utf8JsonWriter(ms);
jsonWriter.WriteFeatureCollectionStart();

var latest = routerDb.Latest;
var edgeEnumerator = latest.GetEdgeEnumerator();
foreach (var vertex in latest.GetVertices())
{
    if (!edgeEnumerator.MoveTo(vertex))
    {
        continue;
    }

    while (edgeEnumerator.MoveNext())
    {
        if (!edgeEnumerator.Forward)
        {
            continue;
        }
        var length = edgeEnumerator.EdgeLength();
        if (length == 0)
        {
            jsonWriter.WriteVertexFeature(VertexId.Empty, edgeEnumerator.HeadLocation);
        }
    }
}
jsonWriter.WriteFeatureCollectionEnd();
jsonWriter.Flush();
Console.WriteLine(Encoding.UTF8.GetString(ms.ToArray()));

Here is for example output in Slovenia.pbf: GeoJson.io and Github Gist(Click Raw to see actual .geojson)

[DavidKarlas]

And also Belgium.pbf: GeoJson.io and Github Gist(Click Raw to see actual .geojson)

[DavidKarlas]

Here is example of route that works with this PR, but not without:
var lux1 = (5.521588, 50.659852, (float?)0f);
var lux2 = (5.525663, 50.659128, (float?)0f);