Enhance event handling for Crew, Task, and Event classes

- Add crew name to failed event types (CrewKickoffFailedEvent, CrewTrainFailedEvent, CrewTestFailedEvent)
- Update Task events to remove redundant task and context attributes
- Refactor EventListener to use Logger for consistent event logging
- Add new event types for Crew train and test events
- Improve event bus event tracking in test cases

src/crewai/utilities/events/task_events.py

@@ -1,4 +1,4 @@
-from typing import Any
+from typing import Any, Optional
 
 from crewai.utilities.events.crew_events import CrewEvent
 
@@ -6,16 +6,15 @@ from crewai.utilities.events.crew_events import CrewEvent
 class TaskStartedEvent(CrewEvent):
     """Event emitted when a task starts"""
 
-    task: Any
     type: str = "task_started"
-
+    context: Optional[str]
     model_config = {"arbitrary_types_allowed": True}
 
 
+
 class TaskCompletedEvent(CrewEvent):
     """Event emitted when a task completes"""
 
-    task: Any
     output: Any
     type: str = "task_completed"