DEV: makes user-stream an unordered list (#11770)

Note, ideally we would drop tagName usage, but I think it's safer to do it in a separate PR in few weeks.

app/assets/javascripts/discourse/app/components/user-stream-item.js

@@ -4,6 +4,8 @@ import { computed } from "@ember/object";
 import { propertyEqual } from "discourse/lib/computed";
 
 export default Component.extend({
+  tagName: "li",
+
   classNameBindings: [
     ":user-stream-item",
     ":item", // DEPRECATED: 'item' class

app/assets/javascripts/discourse/app/components/user-stream.js

@@ -13,6 +13,8 @@ import { popupAjaxError } from "discourse/lib/ajax-error";
 import { schedule } from "@ember/runloop";
 
 export default Component.extend(LoadMore, {
+  tagName: "ul",
+
   _initialize: on("init", function () {
     const filter = this.get("stream.filter");
     if (filter) {

app/assets/stylesheets/common/components/user-stream-item.scss

@@ -10,6 +10,7 @@
     background-color: var(--secondary);
     border-bottom: 1px solid var(--primary-low);
     padding: 1em 0.53em;
+    list-style: none;
 
     &.moderator-action {
       background-color: var(--highlight-medium);