[openstreetmap/openstreetmap-website] Reuse mirrored turn icons (PR #5828)

[Anton Khorev]

There's a pull request #5776 that claims to *reuse mirrored turn icons*, however most of the changes there are not related to mirroring.

This pull request keeps only the mirroring changes from #5776.

You can see all of the directions icons by adding the following test to `test/system/directions_test.rb` and running it:

```ruby
  test "show all routing icons" do
    visit directions_path

    extra_steps = %w[
      straight
      slight-right right sharp-right u-turn-right
      slight-left left sharp-left u-turn-left
      roundabout
      fork-right fork-left
      merge-left merge-right
      end-of-road-right end-of-road-left
      exit-right exit-left
      ferry
    ].map { |name| "[points[1], '#{name}', '#{name}', 0, [points[1]]]" }.join(",")

    stub_routing <<~CALLBACK
      const distance = points[0].distanceTo(points[1]);
      const time = distance * 30;
      return Promise.resolve({
        line: points,
        steps: [
          [points[0], "start", "start", distance, points],
          [points[1], "destination", "destination", 0, [points[1]]],
          #{extra_steps}
        ],
        distance,
        time
      });
    CALLBACK

    fill_in "route_from", :with => "60 30"
    fill_in "route_to", :with => "61 31"
    click_on "Go"

    sleep 1000
  end
```

![image](https://github.com/user-attachments/assets/1e7f5177-13e2-4f8b-a0fc-a56e6699511b)

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5828

-- Commit Summary --

  * Reuse mirrored turn icons

-- File Changes --

    M app/views/directions/search.html.erb (36)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5828.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5828.diff

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