[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/ui/input/components/ImageInput.tsx

@@ -4,10 +4,9 @@ import { Trans, useLingui } from '@lingui/react/macro';
 
 import { isNonEmptyString } from '@sniptt/guards';
 import React from 'react';
-import { getImageAbsoluteURI } from 'twenty-shared';
+import { getImageAbsoluteURI, isDefined } from 'twenty-shared';
 import { Button, IconPhotoUp, IconTrash, IconUpload, IconX } from 'twenty-ui';
 import { REACT_APP_SERVER_BASE_URL } from '~/config';
-import { isDefined } from '~/utils/isDefined';
 
 const StyledContainer = styled.div`
   display: flex;