Fix int.MinValue overflow and CTS disposal in DistributedTracingSample

[Copilot]

Two correctness issues in the DistributedTracingSample GetWeather activity identified during review.

Changes

• Math.Abs overflow (Program.cs): Math.Abs(int.MinValue) overflows back to int.MinValue (still negative), causing IndexOutOfRangeException on the modulo. Replaced with a uint cast, which is both overflow-safe and removes the double GetHashCode() call:

  // Before — unsafe
  string condition = conditions[Math.Abs(city.GetHashCode()) % conditions.Length];
  int temperature = 15 + (Math.Abs(city.GetHashCode()) % 20);
  
  // After — safe, single hash evaluation
  uint hash = (uint)city.GetHashCode();
  string condition = conditions[hash % conditions.Length];
  int temperature = 15 + (int)(hash % 20);

• CancellationTokenSource disposal: Added using declaration so the underlying timer is released when the token source goes out of scope.

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