Add route name to outbound path processing

Added route_name to the $options array in UrlGenerator::generateFromRoute() to support route-specific logic in outbound path processors. Moving to NR.

I found a way around this in the contrib project but I still think this would be good to do given we're adding the route and we have the info.

It'd be good to have some test coverage somewhere I think you might be able to add a test processor in \Drupal\Tests\Core\Routing\UrlGeneratorTest to do this.

Added test coverage. Moving to NR.

Nice test