Optimize "license polling" if the license pool is empty

As a client application
I want the QLS to do some internal "license polling" in case the license pool should be empty
So that I can implement a basic retry mechanism without worrying about request pacing and cause unnecessary network traffic, especially in high demand scenarios.

In 3.5.0 the server should manage the request "polling" internally, so that the License Service (daemon) nor the client application should implement the retry mechanism.

This way we reduce unnecessary network traffic a lot in high load scenarios and put the decision of "license polling" to the server side.