[openstreetmap/openstreetmap-website] Don't set Vary response header (PR #6112)

[Anton Khorev]

Problem:
1. open https://www.openstreetmap.org/traces (or any page with turbo pagination)
2. click *Older Traces* (or older whatever)
3. right-click the tab and select *duplicate* or *duplicate tab*
  ![image](https://github.com/user-attachments/assets/de8e04a0-ee93-43f4-af52-4a60976c47cf)
4. you're going to see something like this
  ![image](https://github.com/user-attachments/assets/79ce95e1-fd3f-422b-9b8a-bad86d537098)

It's the turbo-frame contents, without header, footer and css.

The same is going to happen if you:
1. open the traces page
2. click *Older Traces*
3. close the tab
4. go to history / recently closed tabs and restore the tab

The reason for this is apparently the `Vary` header.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6112

-- Commit Summary --

  * Don't set Vary response header

-- File Changes --

    M app/controllers/application_controller.rb (1)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6112.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6112.diff

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