[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/developers/api-keys/SettingsDevelopersApiKeysNew.tsx

@@ -16,9 +16,9 @@ import { SubMenuTopBarContainer } from '@/ui/layout/page/components/SubMenuTopBa
 import { useLingui } from '@lingui/react/macro';
 import { useRecoilCallback } from 'recoil';
 import { Key } from 'ts-key-enum';
+import { isDefined } from 'twenty-shared';
 import { useGenerateApiKeyTokenMutation } from '~/generated/graphql';
 import { useNavigateSettings } from '~/hooks/useNavigateSettings';
-import { isDefined } from '~/utils/isDefined';
 import { getSettingsPath } from '~/utils/navigation/getSettingsPath';
 
 export const SettingsDevelopersApiKeysNew = () => {