WIP: Update to mui v5

[illume]

Work in progress.

Mostly automated, with a bunch of manual fixes.

• [ ] Sidebar is kind of broken when collapsing it in desktop view
• [ ] Autocomplete filter (like on Namespaces view) is broken, doesn't filter.
• [ ] get snapshot testing working with generated mui class names
• [ ] update snapshots
• [ ] headlamp-plugin webpack config can work with mui v5 (add similar existing config with new mui paths)
• [ ] headlamp-plugin upgrade should also update user plugins to mui v5
• [ ] consider keeping material-ui v4 available to plugins for backwards compat. (keep exporting them for plugins, and have material ui 5 working). Seems to work so far in my testing.
• [ ] example plugins would need updating (using headlamp-plugin upgrade probably).

How to use

Update packages and run headlamp again.

cd frontend
npm i
cd ..
make run-frontend

Testing done

• [x] npm run lint passes
• [x] npm run tsc passes
• [ ] npm run test passes
• [ ] smoke testing
• [ ] updating snapshot tests
• [ ] check dev console for errors
• [ ] a11y testing
• [ ] full manual testing
• [ ] test old plugins still work