DEV: Add topic-map plugin outlet wrapper (#31168)

app/assets/javascripts/discourse/app/components/topic-map/index.gjs

@@ -5,6 +5,10 @@ import TopicMapSummary from "discourse/components/topic-map/topic-map-summary";
 
 const TopicMap = <template>
   {{#unless @model.postStream.loadingFilter}}
+    <PluginOutlet
+      @name="topic-map"
+      @outletArgs={{hash topic=@model postStream=@postStream}}
+    >
       <section class="topic-map__contents">
         <TopicMapSummary
           @topic={{@model}}
@@ -31,6 +35,7 @@ const TopicMap = <template>
           />
         </section>
       {{/if}}
+    </PluginOutlet>
   {{/unless}}
 </template>;