[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/pages/onboarding/CreateWorkspace.tsx

@@ -3,7 +3,6 @@ import { zodResolver } from '@hookform/resolvers/zod';
 import { useCallback } from 'react';
 import { Controller, SubmitHandler, useForm } from 'react-hook-form';
 import { Key } from 'ts-key-enum';
-import { H2Title, Loader, MainButton } from 'twenty-ui';
 import { z } from 'zod';
 
 import { SubTitle } from '@/auth/components/SubTitle';
@@ -21,6 +20,9 @@ import {
   useActivateWorkspaceMutation,
 } from '~/generated/graphql';
 import { isDefined } from 'twenty-shared/utils';
+import { H2Title } from 'twenty-ui/display';
+import { Loader } from 'twenty-ui/feedback';
+import { MainButton } from 'twenty-ui/input';
 
 const StyledContentContainer = styled.div`
   width: 100%;