[LogsDB] [Subscription basic] [otlp_input_otel] Failing test daily: system test: default (variant: grpc) in otlp_input_otel.

- Stack version: maximum of either the version used in PR builds or 8.17.0 (GA version for LogsDB index mode)
- LogsDB: enabled
- Subscription: basic
- Package: otlp_input_otel
- Failing test: system test: default (variant: grpc)
- Owners:
- @elastic/obs-ds-intake-services

Error:
```
could not assign policy to agent: error occurred while waiting for the policy to be assigned to all agents: timeout: policy hasn't been assigned in time
```

First build failed: https://buildkite.com/elastic/integrations/builds/49558

Start with the failing Buildkite run 49558 and the otlp_input_otel system test named “default” with the grpc variant. Reproduce or inspect the policy-assignment timeout and trace the test setup for LogsDB with a basic subscription. Done means the test completes without the agent policy assignment timeout.

Written by the indexing model from the issue text.