refacto(*): remove everything about default workspace (#9157)

## Summary
- [x] Remove defaultWorkspace in user
- [x] Remove all occurrence of defaultWorkspace and defaultWorkspaceId
- [x] Improve activate workspace flow
- [x] Improve security on social login
- [x] Add `ImpersonateGuard`
- [x] Allow to use impersonation with couple `User/Workspace`
- [x] Prevent unexpected reload on activate workspace
- [x] Scope login token with workspaceId 

Fix https://github.com/twentyhq/twenty/issues/9033#event-15714863042

packages/twenty-front/src/modules/auth/graphql/mutations/impersonate.ts

@@ -2,13 +2,14 @@ import { gql } from '@apollo/client';
 
 // TODO: Fragments should be used instead of duplicating the user fields !
 export const IMPERSONATE = gql`
-  mutation Impersonate($userId: String!) {
-    impersonate(userId: $userId) {
-      user {
-        ...UserQueryFragment
+  mutation Impersonate($userId: String!, $workspaceId: String!) {
+    impersonate(userId: $userId, workspaceId: $workspaceId) {
+      workspace {
+        subdomain
+        id
       }
-      tokens {
-        ...AuthTokensFragment
+      loginToken {
+        ...AuthTokenFragment
       }
     }
   }

packages/twenty-front/src/modules/auth/graphql/mutations/signUp.ts

@@ -18,6 +18,10 @@ export const SIGN_UP = gql`
       loginToken {
         ...AuthTokenFragment
       }
+      workspace {
+        id
+        subdomain
+      }
     }
   }
 `;

packages/twenty-front/src/modules/auth/graphql/mutations/verify.ts

@@ -3,9 +3,6 @@ import { gql } from '@apollo/client';
 export const VERIFY = gql`
   mutation Verify($loginToken: String!) {
     verify(loginToken: $loginToken) {
-      user {
-        ...UserQueryFragment
-      }
       tokens {
         ...AuthTokensFragment
       }

packages/twenty-front/src/modules/auth/graphql/queries/checkUserExists.ts

@@ -6,7 +6,6 @@ export const CHECK_USER_EXISTS = gql`
       __typename
       ... on UserExists {
         exists
-        defaultWorkspaceId
         availableWorkspaces {
           id
           displayName