Added a timestamp field to the SystemVariable model and updated the WorkflowAppRunner to include the current timestamp during execution. Enhanced node type checks to recognize trigger nodes in various services, ensuring proper handling of system variables and node outputs in TriggerEventNode and TriggerScheduleNode. This improves the overall workflow execution context and maintains consistency across node types.
- Replaced direct imports of `TriggerProviderID` and `ToolProviderID` from `core.plugin.entities.plugin` with imports from `models.provider_ids` for better organization.
- Refactored workflow node classes to inherit from a unified `Node` class, improving consistency and maintainability.
- Removed unused code and comments to clean up the implementation, particularly in the `workflow_trigger.py` and `builtin_tools_manage_service.py` files.
These changes enhance the clarity and structure of the codebase, facilitating easier future modifications.
