[openstreetmap/openstreetmap-website] Improve error message for VPN using users on sign-up or support VPN sign-up (Issue #6778)

[Harel M]

HarelM created an issue (openstreetmap/openstreetmap-website#6778)

### Problem

We've just got a report from a user that was unable to create an account in OSM (we are using OSM as our identity provider).
When I checked with the user I found out that they were using a VPN (for good reasons I must say), but they were not able to create an account.

### Description

I think it would be beneficial to improve the error message on the sign-up screen to say that you need to turn off your VPN in order to sign up, or simply support this VPN use case.

More information on how to reproduce (What I did locally):
1. Sign up for the free plan in https://protonvpn.com/
2. Download the chrome extension
3. Enable the VPN
4. Go to Open Street Map and try to sign up.

### Screenshots

<img width="1114" height="696" alt="Image" src="https://github.com/user-attachments/assets/9beddd94-846d-4bde-a6c3-aac1793b2fcd" />

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