FIX: Respect blocked domains list when redirecting (#15656)

Our previous implementation used a simple `blocked_domain_array.include?(hostname)`
so some values were not matching. Additionally, in some configurations like ours, we'd used
"cat.*.dog.com" with the assumption we'd support globbing.

This change implicitly allows globbing by blocking "http://a.b.com" if "b.com" is a blocked 
domain but does not actively do anything for "*".

An upcoming change might include frontend validation for values that can be inserted.

lib/retrieve_title.rb

@@ -60,6 +60,10 @@ module RetrieveTitle
     encoding = nil
 
     fd.get do |_response, chunk, uri|
+      if (uri.present? && InlineOneboxer.domain_is_blocked?(uri.hostname))
+        throw :done
+      end
+
       unless Net::HTTPRedirection === _response
         if current
           current << chunk