[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/workflow/components/WorkflowRunOutputVisualizer.tsx

@@ -1,6 +1,7 @@
 import { useWorkflowRun } from '@/workflow/hooks/useWorkflowRun';
 import styled from '@emotion/styled';
-import { CodeEditor, isDefined } from 'twenty-ui';
+import { isDefined } from 'twenty-shared';
+import { CodeEditor } from 'twenty-ui';
 
 const StyledSourceCodeContainer = styled.div`
   margin: ${({ theme }) => theme.spacing(4)};