[openstreetmap/openstreetmap-website] Serve only trackable and identifiable points and add cursor pagination to the trackpoints API (PR #7322)

[Ruben L. Mendoza]

Rub21 left a comment (openstreetmap/openstreetmap-website#7322)

After a conversation with Minh, I checked which clients call the `trackpoints` API. Here are the results.

- JOSM: [`pointsPerPage = 5000`](https://github.com/JOSM/josm/blob/1b1d53f148/src/org/openstreetmap/josm/io/BoundingBoxDownloader.java#L58-L60), stops when a page has fewer than 5,000 points.
- Merkaartor: [loop over pages](https://github.com/openstreetmap/merkaartor/blob/04449ee36f/src/Sync/DownloadOSM.cpp#L400-L402), stops on an empty page.

iD, Rapid, Vespucci and StreetComplete do not download trackpoints from the API.

None of them reads HTTP headers, so I think the `Link` header does not affect them. We kept the `page` mode in this PR working as before, until the clients migrate to the cursor.

cc. @1ec5 


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