codemirror: Upgrade to version 6
Created by: fkling
This commit upgrades all CodeMirror related packages to official major version 6. There are no specific features that we need though bug fixes are always nice.
The issue I encountered in 7d96c4c8caa6cef6d46ce94a32a7c74efee9c1b4 does not exist anymore (either we or CodeMirror changed something).
Test plan
Main query input renders and works (token highlight, info, suggestions) without issues.
App preview:
Check out the client app preview documentation to learn more.