This pull request updates package dependencies, refactors the OpenAI Realtime demo to align with API changes, and modifies related unit tests to reflect these updates. The most significant changes include updating package versions, transitioning from the RealtimeConversation API to the Realtime API, and adjusting test logic to accommodate updated data structures.

Dependency Updates:

• Updated Azure.AI.OpenAI to version 2.2.0-beta.5 and OpenAI to version 2.2.0. [1] [2]
• Updated System.Text.Json to version 8.0.6.
• Upgraded Microsoft.Extensions.AI and related libraries to version 9.7.1.

OpenAI Realtime Demo Refactor:

• Replaced RealtimeConversationClient and related classes with RealtimeClient and its updated API. This includes changes to session initialization, configuration, and item handling in Program.cs. [1] [2] [3]
• Adjusted method calls and data types to align with the new API, such as replacing ConversationItem with RealtimeItem and updating event types like ConversationUpdate to RealtimeUpdate. [1] [2] [3]

Unit Test Updates:

• Updated test cases to use new data structures, such as replacing IReadOnlyList<string> with IReadOnlyList<ReasoningSummaryPart> and adapting related assertions. [1] [2]
• Added OPENAI001 to NoWarn lists in several .csproj files to suppress warnings related to the OpenAI SDK. [1] [2] [3]