[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/auth/Authorize.tsx

@@ -5,10 +5,10 @@ import { useSearchParams } from 'react-router-dom';
 
 import { useRedirect } from '@/domain-manager/hooks/useRedirect';
 import { useLingui } from '@lingui/react/macro';
+import { isDefined } from 'twenty-shared';
 import { MainButton, UndecoratedLink } from 'twenty-ui';
 import { useAuthorizeAppMutation } from '~/generated/graphql';
 import { useNavigateApp } from '~/hooks/useNavigateApp';
-import { isDefined } from '~/utils/isDefined';
 
 type App = { id: string; name: string; logo: string };
 

packages/twenty-front/src/pages/auth/SignInUp.tsx

@@ -18,8 +18,8 @@ import { useIsCurrentLocationOnAWorkspaceSubdomain } from '@/domain-manager/hook
 import { useIsCurrentLocationOnDefaultDomain } from '@/domain-manager/hooks/useIsCurrentLocationOnDefaultDomain';
 import { DEFAULT_WORKSPACE_NAME } from '@/ui/navigation/navigation-drawer/constants/DefaultWorkspaceName';
 import { useMemo } from 'react';
+import { isDefined } from 'twenty-shared';
 import { AnimatedEaseIn } from 'twenty-ui';
-import { isDefined } from '~/utils/isDefined';
 
 import { useSearchParams } from 'react-router-dom';
 import { PublicWorkspaceDataOutput } from '~/generated-metadata/graphql';