Adapt dashboard to show idle and used runners

app/helpers/admin/dashboard_helper.rb

@@ -15,7 +15,18 @@ module Admin
       end
 
       ExecutionEnvironment.order(:id).select(:id, :pool_size).map do |execution_environment|
-        execution_environment.attributes.merge(quantity: pool_size[execution_environment.id])
+        # Fetch the actual values (ID is stored as a symbol) or get an empty hash for merge
+        actual = pool_size[execution_environment.id.to_s.to_sym] || {}
+
+        template = {
+          id: execution_environment.id,
+          prewarmingPoolSize: execution_environment.pool_size,
+          idleRunners: 0,
+          usedRunners: 0,
+        }
+
+        # Existing values in the template get replaced with actual values
+        template.merge(actual)
       end
     end
   end