[openstreetmap/openstreetmap-website] Map XML download with Turbo (PR #6255)

[Marwin Hochfelsner]

hlfan left a comment (openstreetmap/openstreetmap-website#6255)

I could see the whole thing, including handleExportSuccess and handleExportError, made into a higher-order function that's called like:
```js
document.querySelector(".export_form").addEventListener("turbo:submit-end", getTurboDownload("map.osm"));
```
Or a more modular version with a callback:
```js
document.querySelector(".export_form").addEventListener("turbo:submit-end", getTurboBlobHandler(blob => downloadBlob(blob, "map.osm")));
```

But in any case, I'd like to have `downloadBlob` separately to reuse it for the directions geojson download.

As for where to store them, that's probably a question of whether there are any things to download outside of the index/map_layout pages; otherwise, I'd put it there and in the OSM namespace.

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