Adding hreflang as examples removes link preloads

[andershagbard]

Description

Using this library, and having it set the hreflang link header, unsets/doesnt set the preload link header from Next.js when you import CSS and fonts.

Verifications

• I've verified that the problem I'm experiencing isn't covered in the docs.
• I've searched for similar, existing issues on GitHub and Stack Overflow.
• I've compared my app to a working example to look for differences.

Mandatory reproduction URL

https://next-intl-example-app-router.vercel.app/en

Reproduction description

Check response headers

Expected behaviour

I would expect CSS and Font links to be added to the preload Link header

[amannn]

This is a duplicate of #1442. I've created a PR yesterday over at the Next.js repo: vercel/next.js#73431