Register Markdown language in some tests to silence error logs (#13066)
This PR registers the Markdown language in some of the tests in the
`zed` crate to silence the error logs about the language not being found
when the chat panel attempts to load it.
Release Notes:
- N/A
9bc3c6810bMarshall Bowers committed on 6/14/2024, 7:29:20 PM· committed by GitHubparent45ae0dc