trace: Should OpenTelemetry context propagation be disabled?

In googleapis/google-api-go-client/issues/2639, @Pascal-Delange wrote:

> I would say it's safe to assume that the traces from the trace client sending traces itself are going to be noise >99.99% of the time (which will be more or less visible hence more or less annoying depending on the type of app being traced).
(it may still show up if you're profiling the application, but that is a different story)
A default behavior of not sending traces would seem reasonable to me.

Should OpenTelemetry context propagation be disabled in the trace client somehow, perhaps by calling [option.WithTelemetryDisabled](https://pkg.go.dev/google.golang.org/api/option#WithTelemetryDisabled) internally?

See also GoogleCloudPlatform/opentelemetry-operations-go/issues/864