refactor(trigger): remove unnecessary whitespace in trigger-related files

- Cleaned up the code by removing extraneous whitespace in `trigger.py` and `workflow_plugin_trigger_service.py`, improving readability and maintaining code style consistency.

api/core/plugin/impl/trigger.py

@@ -19,7 +19,6 @@ from models.provider_ids import TriggerProviderID
 
 
 class PluginTriggerManager(BasePluginClient):
-
     def fetch_trigger_providers(self, tenant_id: str) -> list[PluginTriggerProviderEntity]:
         """
         Fetch trigger providers for the given tenant.

api/services/trigger/workflow_plugin_trigger_service.py

@@ -1,4 +1,3 @@
-
 from pydantic import BaseModel
 from sqlalchemy import select
 from sqlalchemy.orm import Session