[MM-61087] Fix errcheck linter issues in channels/jobs/helper_test.go (#30643)

Co-authored-by: Claude <noreply@anthropic.com>

server/.golangci.yml

@@ -107,7 +107,6 @@ issues:
         channels/app/team_test.go|\
         channels/app/upload.go|\
         channels/jobs/batch_worker_test.go|\
-        channels/jobs/helper_test.go|\
         channels/jobs/hosted_purchase_screening/worker.go|\
         channels/store/localcachelayer/channel_layer.go|\
         channels/store/localcachelayer/channel_layer_test.go|\