feat(*): allow to select auth providers + add multiworkspace with subdomain management (#8656)

## Summary
Add support for multi-workspace feature and adjust configurations and
states accordingly.
- Introduced new state isMultiWorkspaceEnabledState.
- Updated ClientConfigProviderEffect component to handle
multi-workspace.
- Modified GraphQL schema and queries to include multi-workspace related
configurations.
- Adjusted server environment variables and their respective
documentation to support multi-workspace toggle.
- Updated server-side logic to handle new multi-workspace configurations
and conditions.

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

@@ -3,7 +3,26 @@ import { gql } from '@apollo/client';
 export const CHECK_USER_EXISTS = gql`
   query CheckUserExists($email: String!, $captchaToken: String) {
     checkUserExists(email: $email, captchaToken: $captchaToken) {
-      exists
+      __typename
+      ... on UserExists {
+        exists
+        availableWorkspaces {
+          id
+          displayName
+          subdomain
+          logo
+          sso {
+            type
+            id
+            issuer
+            name
+            status
+          }
+        }
+      }
+      ... on UserNotExists {
+        exists
+      }
     }
   }
 `;