[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/display/chip/components/AvatarChip.tsx

@@ -4,9 +4,9 @@ import { AvatarType } from '@ui/display/avatar/types/AvatarType';
 import { Chip, ChipSize, ChipVariant } from '@ui/display/chip/components/Chip';
 import { IconComponent } from '@ui/display/icon/types/IconComponent';
 import { ThemeContext } from '@ui/theme';
-import { isDefined } from '@ui/utilities/isDefined';
 import { Nullable } from '@ui/utilities/types/Nullable';
 import { MouseEvent, useContext } from 'react';
+import { isDefined } from 'twenty-shared';
 
 // Import Link from react-router-dom instead of UndecoratedLink
 import { Link } from 'react-router-dom';