Drop method caching

ee/app/models/ee/ci/runner.rb

@@ -32,9 +32,7 @@ module EE
 
       class_methods do
         def has_shared_runners_with_non_zero_public_cost?
-          Rails.cache.fetch(:shared_runners_public_cost_factor, expires_in: 1.hour) do
-            ::Ci::Runner.instance_type.where('public_projects_minutes_cost_factor > 0').exists?
-          end
+          ::Ci::Runner.instance_type.where('public_projects_minutes_cost_factor > 0').exists?
         end
       end
     end