[Crunch] Job specified SDK version; log reports it was packed, but not found for installation
See log for qr1hi-8i9sb-w3c5jkyq8vwi5k0.
5029: Fix crunch-job logging when SDK requested+virtualenv unavailable.
- Properly concatenate the message.
- Query and log installed SDK packages in this scenario, since we
might fall back to what's available in the Docker image.