[openstreetmap/openstreetmap-website] Refactoring for to_xml (#2999)

[Andy Allan]

This was originally going to involve getting rid of the to_xml for tracepoints, and move to a builder view for that, but I got bogged down in the gpx file building stuff and had to abandon that.

So this PR is some stand-alone work that was going to be in that PR but may as well be used separately.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2999

-- Commit Summary --

  * Remove unused code
  * Use point.trace instead of an additional gpx_file variable
  * Preload traces for the selected points

-- File Changes --

    M app/controllers/api/tracepoints_controller.rb (16)
    M app/models/user.rb (20)
    M test/models/user_test.rb (20)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2999.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2999.diff

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