message: Remove 'usedBackButton' telemetry
diff: @@ -67,7 +67,6 @@ export class AzureWizard<T extends types.IActionContext> implements types.AzureW
  step.prompted = true;
  } catch (err) {
  if (parseError(err).errorType === 'GoBackError') { // Use `errorType` instead of `instanceof` so that tests can also hit this case
  - this._context.telemetry.properties.usedBackButton = 'true';
  step = this.goBack(step);
  continue;
  } else {
  