[Subscription basic] [zeek] Failing test daily: system test: logs in zeek.intel

- Stack version: Same as in Pull Request builds
- Subscription: basic
- Package: zeek
- Failing test: system test: logs
- DataStream: intel
- Owners:
- @elastic/integration-experience

Error:
```
could not assign policy to agent: error occurred while waiting for the policy to be assigned to all agents: can't get the agent: could not list agents: could not send request to Kibana API: Get "https://127.0.0.1:5601/api/fleet/agents/2dea282d-ea3f-4ea8-b615-2c649d6c2694": context deadline exceeded
```

First build failed: https://buildkite.com/elastic/integrations/builds/44707

Start with the zeek.intel system test: logs and the failing Buildkite build 44707; inspect the policy-assignment path around the Kibana API request shown in the error. Done means the daily system test completes without the agent-list request timing out.

Written by the indexing model from the issue text.