[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/object-metadata/hooks/useObjectNameSingularFromPlural.ts

@@ -2,9 +2,8 @@ import { useRecoilValue } from 'recoil';
 
 import { currentWorkspaceState } from '@/auth/states/currentWorkspaceState';
 import { objectMetadataItemFamilySelector } from '@/object-metadata/states/objectMetadataItemFamilySelector';
-import { isWorkspaceActiveOrSuspended } from 'twenty-shared';
+import { isDefined, isWorkspaceActiveOrSuspended } from 'twenty-shared';
 import { generatedMockObjectMetadataItems } from '~/testing/mock-data/generatedMockObjectMetadataItems';
-import { isDefined } from '~/utils/isDefined';
 
 export const useObjectNameSingularFromPlural = ({
   objectNamePlural,