[openstreetmap/openstreetmap-website] Get directions using fetch (PR #5642)

[Holger Jeromin]

> I still don't know what I need to change in the testing stub

I would guess:

```ruby
  def stub_straight_routing(start_instruction: "Start here", finish_instruction: "Finish there")
    stub_routing <<~CALLBACK
      const distance = points[0].distanceTo(points[1]);
      const time = distance * 30;
      return Promise.resolve({
        line: points,
        steps: [
          [points[0],  8, "<b>1.</b> #{start_instruction}", distance, points],
          [points[1], 14, "<b>2.</b> #{finish_instruction}", 0, [points[1]]]
        ],
        distance,
        time
      });
    CALLBACK
  end

  def stub_routing(callback_code)
    execute_script <<~SCRIPT
      $(() => {
        for (const engine of OSM.Directions.engines) {
          engine.getRoute = (points, signal) => {
              #{callback_code}
          };
        }
      });
    SCRIPT
  end
end


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