[ai agent extension] add support for publishing a hosted agent in Foundry

Add support for the publish flow of a hosted agent: [Use the Microsoft Foundry azd agent extension | Microsoft Learn](https://learn.microsoft.com/en-us/azure/developer/azure-developer-cli/extensions/azure-ai-foundry-extension#provision-and-deploy-the-agent)

> Publish the agent: Create an Agent Application in Microsoft Foundry and deploy the agent as a live, callable service.

Here's an example of the resource needed: [foundry-samples/samples/csharp/FoundryA365/infra/modules/application.bicep at main · microsoft-foun…](https://github.com/microsoft-foundry/foundry-samples/blob/main/samples/csharp/FoundryA365/infra/modules/application.bicep)

The Portal produces a stable endpoint that you can call for /responses and /activityprotocol