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/states/signInUpStepState.ts

@@ -4,8 +4,8 @@ export enum SignInUpStep {
   Init = 'init',
   Email = 'email',
   Password = 'password',
-  SSOEmail = 'SSOEmail',
-  SSOWorkspaceSelection = 'SSOWorkspaceSelection',
+  WorkspaceSelection = 'workspaceSelection',
+  SSOIdentityProviderSelection = 'SSOIdentityProviderSelection',
 }
 
 export const signInUpStepState = createState<SignInUpStep>({