We shouldn't assume the server list is unchanging, this is part of the work to support moving closed PSEs to new page servers Doc: https://docs.google.com/document/d/189n-PDtwvAWC9l7VjmWokgxJpTHzoSgUSLiBwLwOa1U/edit?tab=t.0#heading=h.2s9zdv6a57gn

We should add support and testing for receiving PSE updates where for an existing closed PSE, we receive a new set of Page Servers. This would involve updating the page server tracker, and potentially pruning them in the Page Server connection cache