Flaky: network elastic-package-service_default id 2cc14bcd.... has active endpoints

Spotted in [jenkins build](https://beats-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/Ingest-manager/pipelines/integrations/branches/PR-1933/runs/1/nodes/489/steps/6962/log/?start=0):

```
[2021-10-18T13:05:39.809Z] Removing elastic-package-service_fortinet-fortimail-udp_1 ...
[2021-10-18T13:05:39.809Z]
Removing elastic-package-service_fortinet-firewall-udp_1 ... done

Removing elastic-package-service_fortinet-fortimail-udp_1 ... done

Removing elastic-package-service_fortinet-clientendpoint-tcp_1 ... done

Removing elastic-package-service_fortinet-firewall-tcp_1 ... done

Removing elastic-package-service_fortinet-fortimanager-udp_1 ... done

Removing elastic-package-service_fortinet-logfile_1 ... done

Removing elastic-package-service_fortinet-fortimail-tcp_1 ... done

Removing elastic-package-service_fortinet-clientendpoint-udp_1 ... done

Removing elastic-package-service_fortinet-fortimanager-tcp_1 ... done
Removing network elastic-package-service_default
[2021-10-18T13:05:40.070Z] error while removing network: network elastic-package-service_default id 2cc14bcd07612011e08cf9017417ec4bcc0087df931d99b5c15c6762e7b79040 has active endpoints
[2021-10-18T13:05:40.070Z] Error: error running package system tests: could not complete test run: failed to tear down runner: error tearing down service: could not shut down service using Docker Compose: running Docker Compose down command failed: exit status 1
script returned exit code 1
```