Lint all files in the repo (#9131)

Co-authored-by: openhands <openhands@all-hands.dev>
Co-authored-by: Engel Nyst <enyst@users.noreply.github.com>

openhands/server/data_models/conversation_info.py

@@ -1,7 +1,6 @@
 from dataclasses import dataclass, field
 from datetime import datetime, timezone
 
-from openhands.core.schema.agent import AgentState
 from openhands.integrations.service_types import ProviderType
 from openhands.runtime.runtime_status import RuntimeStatus
 from openhands.storage.data_models.conversation_metadata import ConversationTrigger