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/sign-in-up/components/SignInUpGlobalScopeForm.tsx

@@ -86,10 +86,7 @@ export const SignInUpGlobalScopeForm = () => {
         const response = data.checkUserExists;
         if (response.__typename === 'UserExists') {
           if (response.availableWorkspaces.length >= 1) {
-            const workspace =
-              response.availableWorkspaces.find(
-                (workspace) => workspace.id === response.defaultWorkspaceId,
-              ) ?? response.availableWorkspaces[0];
+            const workspace = response.availableWorkspaces[0];
             return redirectToWorkspaceDomain(workspace.subdomain, pathname, {
               email: form.getValues('email'),
             });