Fix WebAPI sample to use embedded gRPC sidecar

[Copilot]

The WebAPI sample failed with "gRPC server for Durable Task gRPC worker is unavailable" because it expected an external sidecar that wasn't running.

Changes

• Embedded sidecar: Integrated InProcessTestHost's in-memory orchestration service directly into the WebAPI host
• Dual-port Kestrel config: REST API on port 8080 (HTTP/1.1), gRPC sidecar on port 8081 (HTTP/2)
• Project references: Switched from NuGet packages to p2p references (consistent with other samples)
• Cleaned up launchSettings.json: Removed obsolete sidecar address config

Key code changes

// Configure two endpoints
builder.WebHost.ConfigureKestrel(options =>
{
    options.ListenAnyIP(8080, o => o.Protocols = HttpProtocols.Http1);  // REST
    options.ListenAnyIP(8081, o => o.Protocols = HttpProtocols.Http2); // gRPC
});

// Embedded in-memory orchestration service
InMemoryOrchestrationService orchestrationService = new();
builder.Services.AddSingleton<IOrchestrationService>(orchestrationService);
builder.Services.AddSingleton<TaskHubGrpcServer>();

// Worker/client connect to self
GrpcChannel grpcChannel = GrpcChannel.ForAddress("http://localhost:8081");
builder.Services.AddDurableTaskWorker(b => b.UseGrpc(grpcChannel));
builder.Services.AddDurableTaskClient(b => b.UseGrpc(grpcChannel));

Sample now works out of the box without external dependencies.

Original prompt

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This section details on the original issue you should resolve

<issue_title>DurableTaskClient.ScheduleNewProcessOrderOrchestratorInstanceAsync() was failed in the sample 'WebAPI'</issue_title>
<issue_description>The sample 'WebAPI' keeps throwing the following message hence the calling of durableTaskClient.ScheduleNewProcessOrderOrchestratorInstanceAsync() is always failed.

info: Microsoft.DurableTask[3] The gRPC server for Durable Task gRPC worker is unavailable. Will continue retrying.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes DurableTaskClient.ScheduleNewProcessOrderOrchestratorInstanceAsync() was failed in the sample 'WebAPI' #384

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[Copilot]

Pull request overview

This PR fixes a broken WebAPI sample by embedding an in-memory gRPC sidecar directly into the application, eliminating the need for an external sidecar process. The sample previously failed with "gRPC server for Durable Task gRPC worker is unavailable" because it expected an external dependency that wasn't configured.

Key Changes:

• Integrated InProcessTestHost's in-memory orchestration service to provide an embedded gRPC sidecar
• Configured Kestrel with dual endpoints: port 8080 for REST API (HTTP/1.1) and port 8081 for gRPC sidecar (HTTP/2)
• Switched from NuGet package references to project-to-project references, consistent with other samples

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
samples/WebAPI/WebAPI.csproj	Added project references for Client.Grpc, Worker.Grpc, and InProcessTestHost; commented out package references
samples/WebAPI/Properties/launchSettings.json	Simplified launch configuration by removing IIS Express profile, obsolete sidecar address environment variable, and unnecessary browser launch settings
samples/WebAPI/Program.cs	Implemented embedded gRPC sidecar with dual-port Kestrel configuration, in-memory orchestration service, and proper service registrations for TaskHubGrpcServer