[openstreetmap/openstreetmap-website] Add localhost to allowed http redirect_uris for OAuth (PR #4287)

[Sam]

## Further context to understand the use case

- I am developing an application that uses OSM OAuth for login.
- During development I manage my services in containers.
- There is an Nginx reverse proxy that sits in front and proxies services to domains like:

```
app.localhost --> frontend
backend.app.localhost --> backend
s3.app.localhost --> minio
service3.app.localhost --> service3
```

- I need to be able to set the redirect URL in the OpenStreetMap settings to `http://app.localhost/oauth`, which loops back to 127.0.0.1.

## Current workaround

- I get around this by binding the port for the app to my host machine localhost, e.g. `-p 7050:7050`.
- I then set the redirect URL to http://127.0.0.1:7050.
- The service is accessible via http://app.localhost, but the login redirects to http://127.0.0.1 and it still works.

## Steps forward

By the sounds of it there is no interest in proceeding with this PR.

If the extra context has helped clarify why this is useful, then I will happily update the PR to include redirect urls that end in `.localhost`.

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