## Summary
This Pull Request introduces a custom validator for checking forbidden
words in workspaces and refines how exceptions are handled within the
workspace module.
- Introduced `ForbiddenWords` custom class validator for validating
forbidden words against specific fields in `UpdateWorkspaceInput`.
- Added `EnvironmentService` usage in `WorkspaceService` to check
default subdomains.
- New file `workspaceGraphqlApiExceptionHandler` to handle GraphQL API
exceptions with specific error mappings.
- Expanded `WorkspaceExceptionCode` with `SUBDOMAIN_ALREADY_TAKEN`.
- Added new unit tests for validating forbidden words and exception
handler behavior.
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