.NET Declarative Workflows - Integrate updated object model packages.

[crickman]

Will include Foundry specific actions

Packages to update include:

• Microsoft.Bot.ObjectModel
• Microsoft.Bot.ObjectModel.PowerFx
• Microsoft.Microsoft.PowerFx.Interpreter

Executors for the new actions need to be provided (https://github.com/microsoft/agent-framework/tree/main/dotnet/src/Microsoft.Agents.Workflows.Declarative/ObjectModel):

• InvokeAzureAgentExecutor
• AddConversationMessageExecutor
• CopyConversationMessagesExecutor
• RetrieveConversationMessageExecutor
• RetrieveConversationMessagesExecutor

Sample workflows required update at (https://github.com/microsoft/agent-framework/tree/main/workflows).

[crickman]

Fixed in #681