[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/utilities/drag-select/components/DragSelect.tsx

@@ -4,8 +4,7 @@ import {
   useSelectionContainer,
 } from '@air/react-drag-to-select';
 import { useTheme } from '@emotion/react';
-
-import { RGBA } from '@/ui/theme/constants/Rgba';
+import { RGBA } from 'twenty-ui';
 
 import { useDragSelect } from '../hooks/useDragSelect';