feat(trigger): refactor trigger debug event handling and improve response structures

- Renamed and refactored trigger debug event classes to enhance clarity and consistency, including changes from `TriggerDebugEventData` to `TriggerEventData` and related response classes.
- Updated `DraftWorkflowTriggerNodeApi` and `DraftWorkflowTriggerRunApi` to utilize the new event structures, improving the handling of trigger events.
- Removed the `TriggerDebugEventGenerator` class, consolidating event generation directly within the API logic for streamlined processing.
- Enhanced error handling and response formatting for trigger events, ensuring structured outputs for better integration and debugging.

This refactor improves the overall architecture of trigger debugging, making it more intuitive and maintainable.

api/models/trigger.py

@@ -84,6 +84,7 @@ class TriggerSubscription(Base):
             properties=self.properties,
             credential_type=CredentialType(self.credential_type),
             credentials=self.credentials,
+            workflows_in_use=-1,
         )