tools and tool_ids on conversation nodes

The tools and tool_ids fields on type: conversation nodes are deprecated in favor of the new subagent node type.

Impacted API endpoints:

Create Conversation Flow, Update Conversation Flow, Get Conversation Flow, List Conversation Flows, Create Conversation Flow Component, Update Conversation Flow Component, Get Conversation Flow Component, List Conversation Flow Components - fields: tools, tool_ids (on type: conversation nodes)