[CHORE] Avoid isDefined duplicated reference, move it to twenty-shared (#9967)

# Introduction
Avoid having multiple `isDefined` definition across our pacakges
Also avoid importing `isDefined` from `twenty-ui` which exposes a huge
barrel for a such little util function

## In a nutshell
Removed own `isDefined.ts` definition from `twenty-ui` `twenty-front`
and `twenty-server` to move it to `twenty-shared`.
Updated imports for each packages, and added explicit dependencies to
`twenty-shared` if not already in place

Related PR https://github.com/twentyhq/twenty/pull/9941

packages/twenty-front/src/modules/settings/data-model/components/SettingsDataModelNewFieldBreadcrumbDropDown.tsx

@@ -7,7 +7,8 @@ import { useDropdown } from '@/ui/layout/dropdown/hooks/useDropdown';
 import { useTheme } from '@emotion/react';
 import styled from '@emotion/styled';
 import { useLocation, useParams, useSearchParams } from 'react-router-dom';
-import { Button, IconChevronDown, isDefined, MenuItem } from 'twenty-ui';
+import { isDefined } from 'twenty-shared';
+import { Button, IconChevronDown, MenuItem } from 'twenty-ui';
 import { useNavigateSettings } from '~/hooks/useNavigateSettings';
 
 const StyledContainer = styled.div`