UX: display correct replies count in embedded comments view. (#14175)

Previosuly, the reply count included the "small_action" posts too. It also caused the broken embed HTML issue.

spec/fabricators/post_fabricator.rb

@@ -166,3 +166,7 @@ end
 Fabricator(:whisper, from: :post) do
   post_type Post.types[:whisper]
 end
+
+Fabricator(:small_action, from: :post) do
+  post_type Post.types[:small_action]
+end

spec/requests/embed_controller_spec.rb

@@ -229,6 +229,14 @@ describe EmbedController do
 
         expect(response.body).to match(I18n.t('embed.continue'))
         expect(response.body).to match(post.cooked)
+        expect(response.body).to match("<span class='replies'>1 reply</span>")
+
+        small_action = Fabricate(:small_action, topic: topic_embed.topic)
+
+        get '/embed/comments', params: { embed_url: embed_url }, headers: headers
+
+        expect(response.body).not_to match("post-#{small_action.id}")
+        expect(response.body).to match("<span class='replies'>1 reply</span>")
       end
 
       it "provides the topic retriever with the discourse username when provided" do