[openstreetmap/openstreetmap-website] 'GPX Import success' e-mail contains only HTML and not a text part (Issue #5025)

[Martin]

### URL

n/a

### How to reproduce the issue?

The '[OpenStreetMap] GPX Import success' e-mail contains only HTML and not a text part.

The message consists of:

![Screenshot 2024-07-26 at 17 24 32](https://github.com/user-attachments/assets/e05ca973-ff0a-42d2-a4a9-4e4db1365952)


### Screenshot(s) or anything else?

_No response_

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https://github.com/openstreetmap/openstreetmap-website/issues/5025
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