Remove @mui/material

[mlqn]

Description

The @mui/material package should be removed, and its components should be replaced by components from our designsystem

HeaderMenu.tsx and Header.tsx will be removed by #11611 so they don't need to be fixed.

Additional Information

No response

Tasks

No response

Acceptance Criterias

No response

### Tasks
- [ ] https://github.com/Altinn/altinn-studio/issues/12099
- [x] https://github.com/Altinn/altinn-studio/issues/12233
- [x] https://github.com/Altinn/altinn-studio/issues/12234
- [ ] https://github.com/Altinn/altinn-studio/issues/13034