Add model provider information to ChatTurnDetails

[shyamnamboodiripad]

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull Request Overview

This PR adds model provider information to the ChatTurnDetails class to provide better tracking of which provider is being used for AI model interactions. This enhances the evaluation reporting capabilities by including provider context alongside existing model information.

• Adds ModelProvider property to ChatTurnDetails class with appropriate constructor overloads
• Updates chat clients to populate the model provider information from ChatClientMetadata
• Enhances the TypeScript UI to display model provider information in a separate column

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
ChatTurnDetails.cs	Adds ModelProvider property and new constructor overload with JSON serialization support
SimpleChatClient.cs	Retrieves and passes ChatClientMetadata.ProviderName to ChatTurnDetails
ResponseCachingChatClient.cs	Retrieves and passes ChatClientMetadata.ProviderName to ChatTurnDetails
ChatDetailsSection.tsx	Adds separate column for model provider in the UI table
Microsoft.Extensions.AI.Evaluation.Reporting.json	Updates API baseline with new property and constructor
ScenarioRunResultTests.cs	Updates test data to include modelProvider parameter
ResponseCacheTester.cs	Refactors inline variable usage and removes unused import
ChatTurnDetailsTests.cs	Adds comprehensive test coverage for ModelProvider serialization scenarios

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