[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/pages/settings/serverless-functions/SettingsServerlessFunctionDetail.tsx

@@ -19,11 +19,11 @@ import { useIsFeatureEnabled } from '@/workspace/hooks/useIsFeatureEnabled';
 import { useState } from 'react';
 import { useParams } from 'react-router-dom';
 import { useRecoilValue } from 'recoil';
+import { isDefined } from 'twenty-shared';
 import { IconCode, IconGauge, IconSettings, IconTestPipe } from 'twenty-ui';
 import { useDebouncedCallback } from 'use-debounce';
 import { FeatureFlagKey } from '~/generated/graphql';
 import { isDeeplyEqual } from '~/utils/isDeeplyEqual';
-import { isDefined } from '~/utils/isDefined';
 import { getSettingsPath } from '~/utils/navigation/getSettingsPath';
 
 const TAB_LIST_COMPONENT_ID = 'serverless-function-detail';

packages/twenty-front/src/pages/settings/serverless-functions/SettingsServerlessFunctionsNew.tsx

@@ -10,9 +10,9 @@ import { SettingsPath } from '@/types/SettingsPath';
 import { useScopedHotkeys } from '@/ui/utilities/hotkey/hooks/useScopedHotkeys';
 import { useState } from 'react';
 import { Key } from 'ts-key-enum';
+import { isDefined } from 'twenty-shared';
 import { useHotkeyScopeOnMount } from '~/hooks/useHotkeyScopeOnMount';
 import { useNavigateSettings } from '~/hooks/useNavigateSettings';
-import { isDefined } from '~/utils/isDefined';
 import { getSettingsPath } from '~/utils/navigation/getSettingsPath';
 
 export const SettingsServerlessFunctionsNew = () => {