fix(tracing): respect model-data logging redaction for record_model_error_on_span

[sylvesterkaczmarek]

Summary

• route model-span annotation failures through the SDK's model-data-aware logging helper
• avoid attaching traceback or exception data when model-data logging is disabled
• preserve diagnostic exception logging when model-data logging is enabled

record_model_error_on_span() is best-effort and should never turn tracing into a data leak. Previously its fallback logger.warning(..., exc_info=True) bypassed the SDK logging redaction policy.

Test plan

• added focused regression coverage in tests/test_model_error_logging_redaction.py
• GitHub Actions

Issue number

N/A