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-server/src/utils/get-domain-name-by-email.ts

@@ -0,0 +1,19 @@
+export const getDomainNameByEmail = (email: string) => {
+  if (!email) {
+    throw new Error('Email is required');
+  }
+
+  const fields = email.split('@');
+
+  if (fields.length !== 2) {
+    throw new Error('Invalid email format');
+  }
+
+  const domain = fields[1];
+
+  if (!domain) {
+    throw new Error('Invalid email format');
+  }
+
+  return domain;
+};