Add configurable Azure worker post-processing

[DrewScoggins]

Summary

• add a generic, worker-configured post-process hook that runs after successful Crank execution and before cleanup
• preserve argument integrity, sanitized logging, timeout/cancellation, retries, and default-off payload behavior
• validate Service Bus lock-renewal capacity for the complete Crank/post-process retry window

Validation

• 38 targeted tests
• Release build and NuGet pack
• dotnet format --verify-no-changes

Safety

This contains no PerfLab or Azure Storage publishing implementation. Post-processing is disabled unless explicitly enabled in the payload and a trusted executable is configured.