4689 multi workspace i should be able to accept an invite if im already logged in (#5454)

- split signInUp to separate Invitation from signInUp
- update redirection logic
- add a resolver for userWorkspace
- add a mutation to add a user to a workspace
- authorize /invite/hash while loggedIn
- add a button to join a workspace

### Base functionnality

https://github.com/twentyhq/twenty/assets/29927851/a1075a4e-a2af-4184-aa3e-e163711277a1

### Error handling

https://github.com/twentyhq/twenty/assets/29927851/1bdd78ce-933a-4860-a87a-3f1f7bda389e

packages/twenty-front/src/pages/auth/__stories__/SignInUp.stories.tsx

@@ -10,7 +10,6 @@ import {
   PageDecoratorArgs,
 } from '~/testing/decorators/PageDecorator';
 import { graphqlMocks } from '~/testing/graphqlMocks';
-import { mockedOnboardingUsersData } from '~/testing/mock-data/users';
 
 import { SignInUp } from '../SignInUp';
 
@@ -24,14 +23,25 @@ const meta: Meta<PageDecoratorArgs> = {
       handlers: [
         graphql.query(getOperationName(GET_CURRENT_USER) ?? '', () => {
           return HttpResponse.json({
-            data: {
-              currentUser: mockedOnboardingUsersData[0],
-            },
+            data: null,
+            errors: [
+              {
+                message: 'Unauthorized',
+                extensions: {
+                  code: 'UNAUTHENTICATED',
+                  response: {
+                    statusCode: 401,
+                    message: 'Unauthorized',
+                  },
+                },
+              },
+            ],
           });
         }),
         graphqlMocks.handlers,
       ],
     },
+    cookie: '',
   },
 };