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/users/graphql/fragments/userQueryFragment.ts

@@ -1,7 +1,9 @@
+import { ROLE_FRAGMENT } from '@/settings/roles/graphql/fragments/roleFragment';
 import { WORKSPACE_MEMBER_QUERY_FRAGMENT } from '@/workspace-member/graphql/fragments/workspaceMemberQueryFragment';
 import { gql } from '@apollo/client';
 
 export const USER_QUERY_FRAGMENT = gql`
+  ${ROLE_FRAGMENT}
   fragment UserQueryFragment on User {
     id
     firstName
@@ -64,6 +66,9 @@ export const USER_QUERY_FRAGMENT = gql`
         status
       }
       workspaceMembersCount
+      defaultRole {
+        ...RoleFragment
+      }
     }
     workspaces {
       workspace {