[openstreetmap/openstreetmap-website] Limit user registration with the same email address (Issue #3978)

[Wille Marcel]

### Problem

Currently, it's possible to create multiple accounts by adding a `+sometext` to your email address handle. This makes it very easy for vandals to create multiple accounts and try to escape moderation.

### Description

We could limit only 2 accounts by email address, or block new account creation with email addresses of users who received blocks.

### Screenshots

_No response_

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