[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/app/effect-components/PageChangeEffect.tsx

@@ -21,9 +21,9 @@ import { AppPath } from '@/types/AppPath';
 import { PageHotkeyScope } from '@/types/PageHotkeyScope';
 import { SettingsPath } from '@/types/SettingsPath';
 import { useSetHotkeyScope } from '@/ui/utilities/hotkey/hooks/useSetHotkeyScope';
+import { isDefined } from 'twenty-shared';
 import { useIsMatchingLocation } from '~/hooks/useIsMatchingLocation';
 import { usePageChangeEffectNavigateLocation } from '~/hooks/usePageChangeEffectNavigateLocation';
-import { isDefined } from '~/utils/isDefined';
 
 // TODO: break down into smaller functions and / or hooks
 //  - moved usePageChangeEffectNavigateLocation into dedicated hook