[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/activities/timeline-activities/components/TimelineActivities.tsx

@@ -13,8 +13,8 @@ import {
   AnimatedPlaceholderEmptyTextContainer,
   AnimatedPlaceholderEmptyTitle,
   EMPTY_PLACEHOLDER_TRANSITION_PROPS,
-  MOBILE_VIEWPORT,
-} from 'twenty-ui';
+} from 'twenty-ui/layout';
+import { MOBILE_VIEWPORT } from 'twenty-ui/theme';
 
 const StyledMainContainer = styled.div`
   align-items: flex-start;

packages/twenty-front/src/modules/activities/timeline-activities/components/__stories__/TimelineActivities.stories.tsx

@@ -1,12 +1,12 @@
 import { Meta, StoryObj } from '@storybook/react';
 import { HttpResponse, graphql } from 'msw';
-import { ComponentDecorator } from 'twenty-ui';
 
 import { TimelineActivities } from '@/activities/timeline-activities/components/TimelineActivities';
 import { TimelineActivityContext } from '@/activities/timeline-activities/contexts/TimelineActivityContext';
 import { ObjectMetadataItemsDecorator } from '~/testing/decorators/ObjectMetadataItemsDecorator';
 import { SnackBarDecorator } from '~/testing/decorators/SnackBarDecorator';
 import { mockedTimelineActivities } from '~/testing/mock-data/timeline-activities';
+import { ComponentDecorator } from 'twenty-ui/testing';
 
 const meta: Meta<typeof TimelineActivities> = {
   title: 'Modules/TimelineActivities/TimelineActivities',