Content-Type in response header is incorrect on resources in Wiki page
After migration from 11.4.5 to 11.5.0-ee (cb71fca3) the content-type of files stored in the wiki project always return text/plain regardless of the extension/mime
Steps to reproduce
Upload an html page, css and js into the wiki project and access it via the browser.
Go to the wiki and press the link available
What is the current bug behavior?
Content-Type response header for wiki raw file content is incorrect for html, css, js files.
The previous version had the problem described in #26390 (moved) that is no longer an issue in this release.
What is the expected correct behavior?
The correct Content-Type header according to the extension
Output of checks
This bug happens on GitLab.com