[REFACTOR] Twenty UI multi barrel (#11301)

# Introduction
closes https://github.com/twentyhq/core-team-issues/issues/591
Same than for `twenty-shared` made in
https://github.com/twentyhq/twenty/pull/11083.

## TODO
- [x] Manual migrate twenty-website twenty-ui imports

## What's next:
- Generate barrel and migration script factorization within own package
+ tests
- Refactoring using preconstruct ? TimeBox
- Lint circular dependencies
- Lint import from barrel and forbid them

### Preconstruct
We need custom rollup plugins addition, but preconstruct does not expose
its rollup configuration. It might be possible to handle this using the
babel overrides. But was a big tunnel.
We could give it a try afterwards ! ( allowing cjs interop and stuff
like that )
Stuck to vite lib app

Closed related PRs:
- https://github.com/twentyhq/twenty/pull/11294
- https://github.com/twentyhq/twenty/pull/11203

packages/twenty-front/src/modules/workflow/workflow-diagram/constants/NodeIconLeftMargin.ts

@@ -1,5 +1,4 @@
-import { THEME_COMMON } from 'twenty-ui';
-
+import { THEME_COMMON } from 'twenty-ui/theme';
 export const NODE_ICON_LEFT_MARGIN = Number(
   THEME_COMMON.spacing(2).replace('px', ''),
 );

packages/twenty-front/src/modules/workflow/workflow-diagram/constants/NodeIconWidth.ts

@@ -1,5 +1,4 @@
-import { THEME_COMMON } from 'twenty-ui';
-
+import { THEME_COMMON } from 'twenty-ui/theme';
 export const NODE_ICON_WIDTH = Number(
   THEME_COMMON.spacing(6).replace('px', ''),
 );