[openstreetmap/openstreetmap-website] Test Cross-Origin-Opener-Policy header (Issue #6173)

[Marwin Hochfelsner]

hlfan created an issue (openstreetmap/openstreetmap-website#6173)

### Problem

The current solution could break.

### Description

Add a test to ensure the security vulnerability doesn't sneak back in.

### Screenshots

_No response_

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