PERF: Dematerialize topic_reply_count (#9769)

* PERF: Dematerialize topic_reply_count

It's only ever used for trust level promotions that run daily, or compared to 0. We don't need to track it on every post creation.

* UX: Add symbol in TL3 report if topic reply count is capped

* DEV: Drop user_stats.topic_reply_count column

app/assets/javascripts/admin/models/tl3-requirements.js

@@ -12,6 +12,11 @@ export default EmberObject.extend({
     return Math.round((minDaysVisited * 100) / timePeriod);
   },
 
+  @discourseComputed("num_topics_replied_to", "min_topics_replied_to")
+  capped_topics_replied_to(numReplied, minReplied) {
+    return numReplied > minReplied;
+  },
+
   @discourseComputed(
     "days_visited",
     "min_days_visited",

app/assets/javascripts/admin/templates/user-tl3-requirements.hbs

@@ -33,7 +33,7 @@
       <tr>
         <th>{{i18n "admin.user.tl3_requirements.topics_replied_to"}}</th>
         <td>{{check-icon model.tl3Requirements.met.topics_replied_to}}</td>
-        <td>{{model.tl3Requirements.num_topics_replied_to}}</td>
+        <td>{{#if model.tl3Requirements.capped_topics_replied_to}}&ge; {{/if}}{{model.tl3Requirements.num_topics_replied_to}}</td>
         <td>{{model.tl3Requirements.min_topics_replied_to}}</td>
       </tr>
       <tr>