Add test coverage for UseScheduledTasks capability registration

[Copilot]

The UseScheduledTasks() extension method lacked test coverage to verify it correctly registers the WorkerCapability.ScheduledTasks capability with GrpcDurableTaskWorkerOptions.

Changes

• New test file: test/ScheduledTasks.Tests/Extension/DurableTaskWorkerBuilderExtensionsTests.cs

  • Verifies capability is added to default options
  • Verifies capability is added to named options

• Updated: test/ScheduledTasks.Tests/ScheduledTasks.Tests.csproj

  • Added Microsoft.Extensions.DependencyInjection dependency

Test approach

[Fact]
public void UseScheduledTasks_AddsScheduledTasksCapability()
{
    ServiceCollection services = new();
    Mock<IDurableTaskWorkerBuilder> mockBuilder = new();
    mockBuilder.Setup(b => b.Services).Returns(services);
    
    mockBuilder.Object.UseScheduledTasks();
    
    ServiceProvider provider = services.BuildServiceProvider();
    var options = provider.GetRequiredService<IOptions<GrpcDurableTaskWorkerOptions>>();
    options.Value.Capabilities.Should().Contain(P.WorkerCapability.ScheduledTasks);
}

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