[openstreetmap/openstreetmap-website] Add some javascript to check dynamically if the username is already taken (PR #4402)

[Holger Jeromin]

> Also that code looks like it has lots of quite modern javascript in it and I'm not sure what our policy is on what our maximum allowed syntax level is.

This is probably the main point:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining#browser_compatibility
Removing support for non-chrome-edge and other browsers which are older than 3.5 years.

But: Browsers without support will fail on parse of the `<script>` tag and fall back to behaviour which is live now "no direct user check".

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