[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/command-menu/components/CommandMenuTopBar.tsx

@@ -13,7 +13,8 @@ import { useTheme } from '@emotion/react';
 import styled from '@emotion/styled';
 import { useLingui } from '@lingui/react/macro';
 import { useRecoilState, useRecoilValue } from 'recoil';
-import { IconX, isDefined, LightIconButton, useIsMobile } from 'twenty-ui';
+import { isDefined } from 'twenty-shared';
+import { IconX, LightIconButton, useIsMobile } from 'twenty-ui';
 
 const StyledInputContainer = styled.div`
   align-items: center;