Add default role to workspace (#10444)

## Context
Adding a defaultRole to each workspace, this role will be automatically
added when a member joins a workspace via invite link or public link
(seeds work differently though).
Took the occasion to refactor a bit the frontend components, splitting
them in smaller components for more readability.

## Test
<img width="948" alt="Screenshot 2025-02-24 at 14 54 02"
src="https://github.com/user-attachments/assets/13ef1452-d3c9-4385-940c-2ced0f0b05ef"
/>

packages/twenty-front/src/modules/object-metadata/hooks/__mocks__/useFieldMetadataItem.ts

@@ -342,6 +342,17 @@ export const responseData = {
         metadataVersion: 1,
         currentBillingSubscription: null,
         workspaceMembersCount: 1,
+        defaultRole:  {
+          id: 'default-role-id',
+          label: 'Default Role',
+          description: 'Default Role Description',
+          canUpdateAllSettings: true,
+          isEditable: true,
+          canReadAllObjectRecords: true,
+          canUpdateAllObjectRecords: true,
+          canSoftDeleteAllObjectRecords: true,
+          canDestroyAllObjectRecords: true,
+        }
       },
       currentBillingSubscription: null,
       billingSubscriptions: [],