Agentic: Is `topic` field actually equired in conversationAccount?

[benbrown]

Not sure if this field really belongs in this model, though it currently appears in the test data.

Agents-for-js/packages/agents-activity/src/conversation/conversationAccount.ts

Line 41 in 58641ba

topic?: string

[tracyboehrer]

Teams was open to removing this from ConversationAccount. Open discussion about moving it to the Email Entity.