DEV: Add new plugin outlets to edit topic area (#29951)

This PR adds new wrapper plugin outlets in the edit topic area. Adding these wrapper plugin outlets gives us easy access to `__before` and `__after`.

app/assets/javascripts/discourse/app/templates/topic.hbs

@@ -52,22 +52,36 @@
           <div class="edit-topic-title">
             <PrivateMessageGlyph @shouldShow={{this.model.isPrivateMessage}} />
 
+            <PluginOutlet
+              @name="edit-topic-title"
+              @outletArgs={{hash model=this.model buffered=this.buffered}}
+            >
               <TextField
                 @id="edit-title"
                 @value={{this.buffered.title}}
                 @maxlength={{this.siteSettings.max_topic_title_length}}
                 @autofocus="true"
               />
+            </PluginOutlet>
 
             {{#if this.showCategoryChooser}}
+              <PluginOutlet
+                @name="edit-topic-category"
+                @outletArgs={{hash model=this.model buffered=this.buffered}}
+              >
                 <CategoryChooser
                   @value={{this.buffered.category_id}}
                   @onChange={{action "topicCategoryChanged"}}
                   class="small"
                 />
+              </PluginOutlet>
             {{/if}}
 
             {{#if this.canEditTags}}
+              <PluginOutlet
+                @name="edit-topic-tags"
+                @outletArgs={{hash model=this.model buffered=this.buffered}}
+              >
                 <MiniTagChooser
                   @value={{this.buffered.tags}}
                   @onChange={{action "topicTagsChanged"}}
@@ -79,6 +93,8 @@
                     useHeaderFilter=true
                   }}
                 />
+              </PluginOutlet>
+
             {{/if}}
 
             <span>