fix(generator): add otel address

[L2D2Grafana]

Summary 📝

• Fix the local dev trace pipeline: Tempo's OTLP receiver in config/tempo.yaml had no explicit endpoint, so with the newer OTel Collector bundled in Tempo 2.10.x it defaulted to localhost — unreachable from the generator container. Traces never reached Tempo and Traces Drilldown showed "No data". Bind OTLP gRPC/HTTP explicitly to 0.0.0.0:4317 / 0.0.0.0:4318.
• Remove the deprecated opencensus receiver from the Tempo distributor config.

Test 🧪

• Restarted Tempo and confirmed the OTLP gRPC server now listens on [::]:4317 (previously 127.0.0.1:4317).
• tempo_distributor_spans_received_total went from 0 to >27k after the change — Tempo is ingesting spans again.
• generator logs no longer emit dial tcp …:4317: connect: connection refused; traces render in Traces Drilldown.

[Copilot]

Pull request overview

This PR fixes the local development tracing pipeline by explicitly binding Tempo’s OTLP receiver endpoints to listen on all interfaces, ensuring traces sent from other containers (e.g., generator) can reach Tempo instead of being blocked by a localhost-only default.

Changes:

• Set explicit OTLP HTTP and gRPC endpoint bindings to 0.0.0.0:4318 and 0.0.0.0:4317 in Tempo’s distributor receiver config.
• Remove the deprecated opencensus receiver from the Tempo distributor configuration.

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