Thanks for the report - we weren’t expecting the JQuery change to affect string prototype extensions, so we’re digging into that 
As I understand it, it’s just the prototype extensions that are deprecated. So doing something like "mystring".capitalize() will not be allowed.
But you’ll still be able to do stuff like this:
import { capitalize } from "@ember/string";
capitalize("mystring");
So, that’s what I’d recommend you do in the topic-list-previews component 
(more before/after examples here)