[auto-routing] Clears previous routes before running

[philcampeau]

Fixes #10136

Before clicking "Create"

• Branch is derived from the latest master
• Add the pins or archive_alpha_games label if this change will break existing games
• Code passes linter with docker compose exec rack rubocop -a
• Tests pass cleanly with docker compose exec rack rake

Implementation Notes

Explanation of Change

Now, when a player clicks the Auto button, it doesn't update the routes. This change causes the Auto button to clear the existing routes before running its script.

I think this makes more sense than the current application.

In addition to saving everyone clicks, I had a new player tell me well into our second game on the site that he had just then realized that auto-routing wasn't updating his previous routes, and he'd been running under for the majority of the games we had played.

Open to feedback.

Screenshots

Any Assumptions / Hacks

[roseundy]

I disagree with the intent of this PR.

[philcampeau]

Yeah, having read your argument against it on the original request, I agree. Closing.