Handle .avif like an image

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Summary

The .avif file extension is currently not recognized as image format/container

Steps to reproduce

• Upload an AVIF file

Example Project

https://gitlab.com/AB-xdev/avif-demo

What is the current bug behavior?

• AVIF files are handled like a blob
• Files are not displayed in markdown as a HTML page is returned for the file

What is the expected correct behavior?

• AVIF files should be handled like images (e.g. png or gif)
• AVIF are correctly displayed like e.g. on GitHub or inside VS Code's Markdown preview

Relevant logs and/or screenshots

Click to expand

For comparison when using e.g. VS Code AVIFs are displayed correctly inside markdown:

Output of checks

This bug happens on GitLab.com and self-hosted instances.