[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/databases/hooks/useCreateOneDatabaseConnection.ts

@@ -3,12 +3,12 @@ import { useMutation } from '@apollo/client';
 import { CREATE_ONE_DATABASE_CONNECTION } from '@/databases/graphql/mutations/createOneDatabaseConnection';
 import { GET_MANY_DATABASE_CONNECTIONS } from '@/databases/graphql/queries/findManyDatabaseConnections';
 import { useApolloMetadataClient } from '@/object-metadata/hooks/useApolloMetadataClient';
+import { isDefined } from 'twenty-shared';
 import {
   CreateRemoteServerInput,
   CreateServerMutation,
   CreateServerMutationVariables,
 } from '~/generated-metadata/graphql';
-import { isDefined } from '~/utils/isDefined';
 
 export const useCreateOneDatabaseConnection = () => {
   const apolloMetadataClient = useApolloMetadataClient();