fix: Update specs, add background response job implementation for copilot threads (#11600)

- Enable jobs by default when a copilot thread or a message is created.
- Rename thread_id to copilot_thread_id to keep it consistent with the
model name
- Add a spec for search_linear_issues service

enterprise/app/helpers/captain/chat_helper.rb

@@ -13,6 +13,9 @@ module Captain::ChatHelper
     )
 
     handle_response(response)
+  rescue StandardError => e
+    Rails.logger.error "#{self.class.name} Assistant: #{@assistant.id}, Error in chat completion: #{e}"
+    raise e
   end
 
   private