Orchestrator function code failures don't contain any information

When orchestrator function code directly throws an exception, the details of the exception are not logged. Instead, only the following is visible:

Unexpected failure in the task execution

This makes it very difficult to determine the actual cause of the failure.

Expected

Details of the exception should be included in the log message that gets logged by the Functions host.

首先追蹤 Java SDK 如何處理由 orchestrator 函式直接拋出的例外，以及「Unexpected failure in the task execution」訊息記錄在哪裡。找出現有的記錄相關測試（如果有），並使用它們驗證問題修正後例外詳細資訊會出現在 Functions host log 中。