[openstreetmap/openstreetmap-website] Send `Last-Modified` Header for Precompiled Assets (Issue #5958)

[Marwin Hochfelsner]

hlfan created an issue (openstreetmap/openstreetmap-website#5958)

### Problem

When checking that the website behaves correctly, I don't have an easy way to tell whether a feature from the repository is already live.

### Description

If precompiled assets included a `Last-Modified` header, I could reasonably assume that features merged into the main branch before that time (plus deployment buffer) are already live.

### Screenshots

_No response_

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