[openstreetmap/openstreetmap-website] Replace trace-related fixtures with factories. (#1347)

[Andy Allan]

> So I'm interested in why you think it's a worse solution?

Mainly just the slowdown from having to write files to disk (when they already exist elsewhere on the disk anyway), which is a big slowdown compared to stubbing things, especially when the models only need to *read* from disk anyway. Then if we're writing stuff to disk during a test, we need to make sure we clean everything up again. With the stubbing, when the tests finish (or are interrupted) there's nothing permanent.

So that's why I prefer stubbing to shifting things around on disk. But if you'd prefer to do the disk approach I can do that.

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