[Subscription basic] [zscaler_zpa] Failing test daily: system test: default in zscaler_zpa.app_connector_status

- Stack version: Same as in Pull Request builds
- Subscription: basic
- Package: zscaler_zpa
- Failing test: system test: default
- DataStream: app_connector_status
- Owners:
- @elastic/security-service-integrations
- @elastic/sit-crest-contractors

Error:
```
could not setup service: could not boot up service using Docker Compose: running Docker Compose up command failed: exit status 18: Head "https://docker.elastic.co/v2/observability/stream/manifests/v0.18.0": dial tcp 34.56.16.77:443: i/o timeout
```

First build failed: https://buildkite.com/elastic/integrations/builds/49174

Start with the zscaler_zpa system test: default for the app_connector_status data stream and rerun its Docker Compose setup. Inspect the service boot failure involving the v0.18.0 observability/stream manifest; done means the system test completes successfully in the build environment.

Written by the indexing model from the issue text.