Dispose CancellationTokenSource in DistributedTracingSample

[Copilot]

CancellationTokenSource created with a TimeSpan constructor internally allocates a timer that must be explicitly disposed. The inline construction in Program.cs skipped disposal.

Change

Assign the CancellationTokenSource to a using-declared local variable so the timer is released when it goes out of scope:

// Before
OrchestrationMetadata result = await client.WaitForInstanceCompletionAsync(
    instanceId,
    getInputsAndOutputs: true,
    new CancellationTokenSource(TimeSpan.FromSeconds(60)).Token);

// After
using CancellationTokenSource timeoutCts = new CancellationTokenSource(TimeSpan.FromSeconds(60));
OrchestrationMetadata result = await client.WaitForInstanceCompletionAsync(
    instanceId,
    getInputsAndOutputs: true,
    timeoutCts.Token);

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