async pollOnce(options = {}) {
        if (!this.isDone()) {
            this.operation = await this.operation.update({
                abortSignal: options.abortSignal,
                fireProgress: this.fireProgress.bind(this),
            });
        }
        this.processUpdatedState();
    }
Returns a promise that will resolve once a single polling request finishes.
It does this by calling the update method of the Poller's operation.

It only optionally receives an object with an abortSignal property, from \@azure/abort-controller's AbortSignalLike.

@param options - Optional properties passed to the operation's update method.