Implemented a feature to check the availability of subdomains when
updating workspace settings. This includes a new mutation,
`isSubdomainAvailable`, to validate subdomain availability through
GraphQL. The frontend now verifies if a subdomain is available to
prevent duplicates during updates.
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Co-authored-by: Weiko <corentin@twenty.com>
## 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.
