DEV: add logo URL and locale details to the Discover stats. (#26320)

We will be collecting the logo URL and the site's default locale values along with existing basic details to display the site on the Discourse Discover listing page. It will be included only if the site is opted-in by enabling the "`include_in_discourse_discover`" site setting.

Also, we no longer going to use `about.json` and `site/statistics.json` endpoints retrieve these data. We will be using only the `site/basic-info.json` endpoint.

lib/guardian.rb

@@ -637,6 +637,10 @@ class Guardian
     other && authenticated? && other.is_a?(User) && @user == other
   end
 
+  def is_discourse_hub_request?
+    request&.user_agent == "Discourse Hub"
+  end
+
   private
 
   def is_my_own?(obj)

lib/statistics.rb

@@ -47,8 +47,4 @@ class Statistics
       count: User.real.count,
     }
   end
-
-  def self.discourse_discover
-    { enrolled: SiteSetting.include_in_discourse_discover? }
-  end
 end