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/task.py

@@ -371,7 +371,7 @@ class Task(BaseModel):
             tools = tools or self.tools or []
 
             self.processed_by_agents.add(agent.role)
-            event_bus.emit(self, TaskStartedEvent(task=self))
+            event_bus.emit(self, TaskStartedEvent(context=context))
             result = agent.execute_task(
                 task=self,
                 context=context,
@@ -451,7 +451,7 @@ class Task(BaseModel):
                         else result
                     )
                     self._save_file(content)
-            event_bus.emit(self, TaskCompletedEvent(task=self, output=task_output))
+            event_bus.emit(self, TaskCompletedEvent(output=task_output))
             return task_output
         except Exception as e:
             self.end_time = datetime.datetime.now()