fix: resolve lint issues in human input event streaming implementation

- Remove unused imports from server modules and test files
- Fix undefined variable references in test assertions
- All ruff checks now pass locally

Co-Authored-By: João <joao@crewai.com>

src/crewai/server/event_stream_manager.py

@@ -2,7 +2,6 @@ import asyncio
 import json
 import uuid
 from typing import Dict, List, Optional, Set
-from datetime import datetime, timezone
 
 from crewai.utilities.events.crewai_event_bus import crewai_event_bus
 from crewai.utilities.events.task_events import HumanInputRequiredEvent, HumanInputCompletedEvent

src/crewai/server/human_input_server.py

@@ -1,8 +1,6 @@
 import asyncio
 import json
-import queue
-import uuid
-from typing import Optional, Dict, Any
+from typing import Optional
 from datetime import datetime, timezone
 
 try: