Fix two build errors in CoreGenerativeAITechniques.sln

[Copilot]

Two compiler errors introduced by upstream SDK changes were breaking the CI build for samples/CoreSamples/CoreGenerativeAITechniques.sln.

AgentLabs-02-Functions — CS0121 ambiguous overload

Azure.AI.Agents.Persistent 1.2.0-beta.8 added a new SubmitToolOutputsToRunAsync overload accepting IEnumerable<ToolApproval>, making the two-arg call ambiguous. Fixed by passing CancellationToken.None explicitly:

// Before
runResponse = await persistentClient.Runs.SubmitToolOutputsToRunAsync(runResponse, toolOutputs);

// After
runResponse = await persistentClient.Runs.SubmitToolOutputsToRunAsync(runResponse, toolOutputs, CancellationToken.None);

MCP-02-HuggingFace-Ollama — CS1061 missing AsBuilder

OllamaApiClient (OllamaSharp 5.x) implements IChatClient directly, but the code was bridging through Semantic Kernel (.AsChatCompletionService().AsChatClient()) which left the compiler resolving the concrete type rather than the interface — so the AsBuilder() extension from Microsoft.Extensions.AI wasn't found. Additionally, the project only referenced Microsoft.Extensions.AI.Abstractions, which doesn't include AsBuilder/UseFunctionInvocation.

• Replaced Microsoft.Extensions.AI.Abstractions with Microsoft.Extensions.AI 10.3.0 (consistent with other samples)
• Removed the unnecessary SK bridge; assign directly to IChatClient

// Before
var client = new OllamaApiClient(uri, deploymentName)
    .AsChatCompletionService()
    .AsChatClient()
    .AsBuilder()
    .UseFunctionInvocation()
    .Build();

// After
IChatClient ollamaClient = new OllamaApiClient(uri, deploymentName);
var client = ollamaClient
    .AsBuilder()
    .UseFunctionInvocation()
    .Build();

Original prompt

Fix the failing GitHub Actions workflow Build .NET Projects (samples/CoreSamples/CoreGenerativeAITechniques.sln, Core Samples)
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 65193236999
Job URL: https://github.com/microsoft/Generative-AI-for-beginners-dotnet/actions/runs/22502597796/job/65193236999

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