Fix long polling to default to 50 s instead of 50 ns
This default value appears to have been wrong for a long time. On GitLab.com, we don't see this problem because we manually set the value to 50s
:
$ git grep long_polling
roles/gprd-base-fe-api.json: "api_ci_long_polling_duration": "50s",
roles/gstg-base-fe-api.json: "api_ci_long_polling_duration": "50s",
Edited by Stan Hu