[openstreetmap/openstreetmap-website] Update num_changes when backfilling changesets (PR #6361)

[mmd]

mmd-osm left a comment (openstreetmap/openstreetmap-website#6361)

> Could the issue be, that current_num_changes counts only the objects where some values (tags/location/members) had really changed

Let's take a look at your second changeset: https://master.apis.dev.openstreetmap.org/changeset/437817

Since you have uploaded both relation and node in the osmChange message, both of them end up with a new version in that changeset:

<img width="333" height="177" alt="image" src="https://github.com/user-attachments/assets/425b454c-aac9-42dd-9545-82dc5d29ecec" />

Now, in the changeset metadata https://master.apis.dev.openstreetmap.org/api/0.6/changeset/437817 , we can see the number of changes as expected:

```
changes_count="2"
```

So the number of changes reflects any new/modified/deleted object version in that changeset. It doesn't really matter if you're re-uploading the exact same object again. The issue is non-deterministic and timing dependent, otherwise we would see this for many more changesets.





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