[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/CommandMenuList.tsx

@@ -12,7 +12,8 @@ import { SelectableList } from '@/ui/layout/selectable-list/components/Selectabl
 import { AppHotkeyScope } from '@/ui/utilities/hotkey/types/AppHotkeyScope';
 import { ScrollWrapper } from '@/ui/utilities/scroll/components/ScrollWrapper';
 import styled from '@emotion/styled';
-import { MOBILE_VIEWPORT, isDefined } from 'twenty-ui';
+import { isDefined } from 'twenty-shared';
+import { MOBILE_VIEWPORT } from 'twenty-ui';
 
 const MOBILE_NAVIGATION_BAR_HEIGHT = 64;