[LogsDB] [Stack 8.19.21-SNAPSHOT] [network_traffic] Failing test daily: system test: mysql-long-result in network_traffic.mysql

- Stack version: 8.19.21-SNAPSHOT
- LogsDB: enabled
- Package: network_traffic
- Failing test: system test: mysql-long-result
- DataStream: mysql
- Owners:
- @elastic/security-service-integrations

Error:
```
could not add data stream config to policy: could not create package policy (req {"name":"network_traffic-mysql-88224","description":"","namespace":"88224","policy_id":"4737a445-4ced-438c-a4b5-ca3e9d1b0e60","package":{"name":"network_traffic","version":"1.34.3"},"inputs":{"network-packet":{"enabled":true,"vars":{"interface":"/tmp/service_logs/mysql_long_result.pcap"},"streams":{"network_traffic.amqp":{"enabled":false},"network_traffic.cassandra":{"enabled":false},"network_traffic.dhcpv4":{"enabled":false},"network_traffic.dns":{"enabled":false},"network_traffic.flow":{"enabled":false},"network_traffic.http":{"enabled":false},"network_traffic.icmp":{"enabled":false},"network_traffic.memcached":{"enabled":false},"network_traffic.mongodb":{"enabled":false},"network_traffic.mysql":{"enabled":true},"network_traffic.nfs":{"enabled":false},"network_traffic.pgsql":{"enabled":false},"network_traffic.redis":{"enabled":false},"network_traffic.sip":{"enabled":false},"network_traffic.thrift"
```

First build failed: https://buildkite.com/elastic/integrations/builds/49243

Start with the network_traffic package's mysql system test, specifically the failing mysql-long-result case and its package-policy setup. Reproduce it using the 8.19.21-SNAPSHOT stack with LogsDB enabled and inspect the reported policy-creation error. Done means the daily system test passes and the mysql data stream can be configured successfully.

Written by the indexing model from the issue text.