[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/admin-panel/components/SettingsAdminContent.tsx

@@ -14,7 +14,7 @@ import styled from '@emotion/styled';
 import { isNonEmptyString } from '@sniptt/guards';
 import { useState } from 'react';
 import { useRecoilValue } from 'recoil';
-import { getImageAbsoluteURI } from 'twenty-shared';
+import { getImageAbsoluteURI, isDefined } from 'twenty-shared';
 import {
   Button,
   H1Title,
@@ -22,7 +22,6 @@ import {
   H2Title,
   IconSearch,
   IconUser,
-  isDefined,
   Section,
   Toggle,
 } from 'twenty-ui';

packages/twenty-front/src/modules/settings/admin-panel/hooks/useFeatureFlagsManagement.ts

@@ -1,10 +1,10 @@
 import { UserLookup } from '@/settings/admin-panel/types/UserLookup';
 import { useState } from 'react';
-import { isDefined } from 'twenty-ui';
+import { isDefined } from 'twenty-shared';
 import {
+  FeatureFlagKey,
   useUpdateWorkspaceFeatureFlagMutation,
   useUserLookupAdminPanelMutation,
-  FeatureFlagKey,
 } from '~/generated/graphql';
 
 export const useFeatureFlagsManagement = () => {

packages/twenty-front/src/modules/settings/admin-panel/hooks/useImpersonate.ts

@@ -6,8 +6,8 @@ import { isAppWaitingForFreshObjectMetadataState } from '@/object-metadata/state
 import { AppPath } from '@/types/AppPath';
 import { useState } from 'react';
 import { useRecoilState, useRecoilValue, useSetRecoilState } from 'recoil';
+import { isDefined } from 'twenty-shared';
 import { useImpersonateMutation } from '~/generated/graphql';
-import { isDefined } from '~/utils/isDefined';
 
 export const useImpersonate = () => {
   const [currentUser] = useRecoilState(currentUserState);