[openstreetmap/openstreetmap-website] Add 'Load more' button that loads newer changesets to history pages (PR #5812)

[Anton Khorev]

If you get to the user's history page from the heatmap, it will start on a selected date. You can scroll down, press *Load more* and and load changesets that were created before the initially visible set. But what if you want to see changesets created after the date?

This PR adds a *Load more* button in frond of the changeset list, if there are any changesets that were opened after the ones in the list.

![image](https://github.com/user-attachments/assets/69ce41be-ae9a-4405-8f81-e67638f3dc10) ![image](https://github.com/user-attachments/assets/7e3d054b-42ce-4ebf-8d03-eb0387263c13)


You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5812

-- Commit Summary --

  * Add 'after' parameter to history pages
  * Preserve sidebar scroll position when prepending to history

-- File Changes --

    M app/assets/javascripts/index/history.js (35)
    M app/controllers/changesets_controller.rb (12)
    M app/views/changesets/index.html.erb (26)
    M test/controllers/changesets_controller_test.rb (25)
    M test/system/history_test.rb (28)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5812.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5812.diff

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