[UI] Remove theme constants from twenty-front and use the ones exported from twenty-ui. (#5558)

Some parts of the Frontend used theme constants exported from
`modules/ui` while other parts used theme constants exported from
`twenty-ui`.

This PR centralizes theme constants by removing them from `modules/ui`
completely.

packages/twenty-front/src/modules/ui/feedback/loader/components/Loader.tsx

@@ -1,7 +1,6 @@
 import styled from '@emotion/styled';
 import { motion } from 'framer-motion';
-
-import { ThemeColor } from '@/ui/theme/constants/MainColorNames';
+import { ThemeColor } from 'twenty-ui';
 
 const StyledLoaderContainer = styled.div<{
   color?: ThemeColor;