[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-ui/src/utilities/utils/getDisplayValueByUrlType.ts

@@ -1,5 +1,5 @@
 import { LinkType } from '@ui/navigation/link';
-import { isDefined } from '../isDefined';
+import { isDefined } from 'twenty-shared';
 
 type getUrlDisplayValueByUrlTypeProps = {
   type: LinkType;