Fix formatting of steps and next_steps fields

Author: NirajC-Microsoft

src/backend/common/models/messages_kernel.py

@@ -274,5 +274,5 @@ class AgentMessageData(BaseDataModel):
     agent_type: AgentMessageType = AgentMessageType.AI_AGENT
     content: str
     raw_data: str
-    steps: List[Any] = Field(default_factory=list)       
-    next_steps: List[Any] = Field(default_factory=list) 
+    steps: List[Any] = Field(default_factory=list)
+    next_steps: List[Any] = Field(default_factory=list)