Based on this article: https://mui.com/material-ui/guides/minimizing-bundle-size/ importing from `'@mui/icons-material'` instead of specifying the actual path to the icon like `import Delete from '@mui/icons-material/Delete';` can be up to six time slower. This change changes all named imports in Unleash referencing the `@mui/icons-material` to default imports. This reduced the amount of modules we had to process when building the frontend from 15206 to 4746 Before: <img width="1016" alt="Skjermbilde 2024-03-11 kl 14 19 58" src="https://github.com/Unleash/unleash/assets/16081982/f137d24a-6557-4183-a40f-f62a33524520"> After: <img width="1237" alt="Skjermbilde 2024-03-11 kl 14 20 32" src="https://github.com/Unleash/unleash/assets/16081982/05a27d6a-2c3f-4409-9862-7188ab4b9c72"> Build time locally decreased by around 50% Before: <img width="1504" alt="Skjermbilde 2024-03-11 kl 14 31 45" src="https://github.com/Unleash/unleash/assets/16081982/bc931559-b022-47ed-9f8f-c87401578518"> After: <img width="1219" alt="Skjermbilde 2024-03-11 kl 14 27 00" src="https://github.com/Unleash/unleash/assets/16081982/3c3a8d6b-576d-45c3-aa40-cc5f95d9df2b">
