[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/settings/admin-panel/SettingsAdminSecondaryEnvVariables.tsx

@@ -5,9 +5,9 @@ import { SettingsPath } from '@/types/SettingsPath';
 import { SubMenuTopBarContainer } from '@/ui/layout/page/components/SubMenuTopBarContainer';
 import styled from '@emotion/styled';
 import { t } from '@lingui/core/macro';
-import { H2Title } from 'twenty-ui';
 import { useGetEnvironmentVariablesGroupedQuery } from '~/generated/graphql';
 import { getSettingsPath } from '~/utils/navigation/getSettingsPath';
+import { H2Title } from 'twenty-ui/display';
 
 const StyledGroupContainer = styled.div``;