Fix CancellationToken registration capturing the OperationContext #5749
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We coalesce cancellation tokens to reduce timer registration and cancellation. We were capturing the execution context which was capturing the OperationContext which is stored in an AsyncLocal. By calling CancellationToken.UnsafeRegister, it prevents the execution context from being captured. This was showing up as a pseudo memory leak (not actually leaking memory, but holding on to it for an extended period).