[Subscription basic] [otlp_input_otel] Failing test daily: system test: only-traces (variant: grpc) in otlp_input_otel.

- Stack version: Same as in Pull Request builds
- Subscription: basic
- Package: otlp_input_otel
- Failing test: system test: only-traces (variant: grpc)
- Owners:
- @elastic/obs-ds-intake-services

Failure:
```
test case failed: no data streams matching traces-*-45346,logs-*-45346 appeared within 10m0s
```

First build failed: https://buildkite.com/elastic/integrations/builds/49248

Start with the otlp_input_otel package and the system test named "only-traces" with the grpc variant, then inspect the first failing Buildkite run linked in the issue. Determine why no matching traces data stream appears within 10 minutes; done means the daily test passes and the expected stream is created.

Written by the indexing model from the issue text.