[LogsDB] [Stack 8.19.21-SNAPSHOT] [zeek] Failing test daily: system test: logs in zeek.irc

- Stack version: 8.19.21-SNAPSHOT
- LogsDB: enabled
- Package: zeek
- Failing test: system test: logs
- DataStream: irc
- 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/f17cf809-445a-492e-9cdd-c77c881ab978": context deadline exceeded
```

First build failed: https://buildkite.com/elastic/integrations/builds/49335

Start with the zeek.irc system test and the failing Buildkite run to reproduce the timeout while assigning policy to the agent. Trace the Kibana API request and test setup around agent assignment; done means the test completes without the policy-assignment timeout.

Written by the indexing model from the issue text.