feat: use short_summary for downloading reports [CW-2962] (#8733)

app/builders/v2/report_builder.rb

@@ -46,6 +46,14 @@ class V2::ReportBuilder
     }
   end
 
+  def short_summary
+    {
+      conversations_count: conversations.count,
+      avg_first_response_time: avg_first_response_time_summary,
+      avg_resolution_time: avg_resolution_time_summary
+    }
+  end
+
   def conversation_metrics
     if params[:type].equal?(:account)
       live_conversations

app/helpers/api/v2/accounts/reports_helper.rb

@@ -37,7 +37,7 @@ module Api::V2::Accounts::ReportsHelper
           business_hours: ActiveModel::Type::Boolean.new.cast(params[:business_hours])
         }
       )
-    ).summary
+    ).short_summary
   end
 
   private