This pull request improves the error handling and logging for background task processing in the gRPC worker, ensuring that when an error occurs, the system properly abandons the relevant work item and logs the process for orchestrator, activity, and entity work items. It also introduces comprehensive tests to verify the new logging behavior.

Enhanced error handling and logging:

• Added logic to RunBackgroundTask in GrpcDurableTaskWorker.Processor to explicitly abandon orchestrator, activity, and both versions of entity work items when an error occurs, with detailed logging for each step. Throws an exception if the work item type is unknown.
• Introduced new logger messages in Logs.cs for "abandoning" and "abandoned" states for orchestrator, activity, and entity work items, each with distinct event IDs and message formats.

Testing improvements:

• Added a new test suite RunBackgroundTaskLoggingTests that verifies the correct logging and abandonment behavior for orchestrator, activity, and both versions of entity work items when errors are encountered during background task processing.