[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/data-model/objects/forms/components/SettingsDataModelObjectAboutForm.tsx

@@ -10,6 +10,7 @@ import { useTheme } from '@emotion/react';
 import styled from '@emotion/styled';
 import { plural } from 'pluralize';
 import { Controller, useFormContext } from 'react-hook-form';
+import { isDefined } from 'twenty-shared';
 import {
   AppTooltip,
   Card,
@@ -19,7 +20,6 @@ import {
 } from 'twenty-ui';
 import { z } from 'zod';
 import { computeMetadataNameFromLabel } from '~/pages/settings/data-model/utils/compute-metadata-name-from-label.utils';
-import { isDefined } from '~/utils/isDefined';
 
 export const settingsDataModelObjectAboutFormSchema = objectMetadataItemSchema
   .pick({