[openstreetmap/openstreetmap-website] Ensure that urls are only valid if the entire string is a url (#2579)

[Andy Allan]

> I hadn't done anything with this because I wasn't sure there was any point spending time on a temporary solution when we plan to switch to `validates_url` once there is a new release..

The last release was over 12 months ago, and the PR that we need was merged over 6 months ago. I don't think `validates_url` has a release cadence worth waiting for!

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