feat: implement sub-steps management in workflow editor
- Added functionality for creating, updating, and deleting sub-steps within the workflow editor. - Introduced a modal for adding new sub-steps, including fields for name and description. - Enhanced the UI to display sub-steps with status indicators and options for updating their status. - Updated navigation links to reflect changes in the workflow structure, ensuring consistency across the application. - Refactored related components to accommodate the new sub-steps feature, improving overall workflow management.
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