[openstreetmap/openstreetmap-website] Leading and trailing spaces in traces tags (Issue #3596)

[Anton Khorev]

### URL

https://www.openstreetmap.org/traces/new

### How to reproduce the issue?

Is it supposed to be possible to have leading and trailing whitespace in tags? I suspect that not because the tag string is split by this regexp: `/\s*,\s*/`. It will strip leading/trailing spaces from everything in the middle but not leading spaces from the first tag and trailing spaces from the last one.

1. go to *upload gps trace* page
2. set tag input to something like <pre>               1,2,3                  </pre>
3. set everything else to valid values and upload a file
4. after successful upload see what the tag links look like

Example:
https://master.apis.dev.openstreetmap.org/user/ankhtest1/traces/2041

### Screenshot(s) or anything else?

_No response_

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