Activities that fail with complex exceptions do not preserve inner exceptions

🐛 **Describe the bug**
> When an activity fails with a complex exception (exception derived from inner exception), the inner exception is not preserved to the logs

🤔 **Expected behavior**
> Inner exceptions should be logged as well as outer

☕ **Steps to reproduce**
Function code:
```python

@bp.activity_trigger(input_name="instance2")
def raise_complex_exception(instance2: str) -> str:
global attempt_count
if instance2 not in attempt_count:
attempt_count[instance2] = 1
raise InvalidOperationException(f"This activity failed") from OverflowException(
"More information about the failure")
return "This activity succeeded"

```
Output:
```
[2025-07-10T22:27:53.159Z] Executed 'Functions.raise_complex_exception' (Failed, Id=be9eec7c-214e-4c34-9570-4d123863f196, Duration=35ms)
[2025-07-10T22:27:53.160Z] System.Private.CoreLib: Exception while executing function: Functions.raise_complex_exception. System.Private.CoreLib: Result: Failure
Exception: InvalidOperationException: This activity failed
Stack: File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.11/WINDOWS/X64\azure_functions_worker\dispatcher.py", line 671, in _handle__invocation_request
call_result = await self._loop.run_in_executor(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
```

⚡**If deployed to Azure**
N/A

Beginne mit dem im Traceback gezeigten Python-Worker-Pfad, insbesondere azure_functions_worker/dispatcher.py im Bereich _handle__invocation_request. Reproduziere den Aktivitätsfehler mithilfe der bereitgestellten Ausnahmekette und untersuche, wie der Fehler serialisiert und protokolliert wird. Als erledigt gilt die Aufgabe, wenn die Logs sowohl die äußere InvalidOperationException als auch deren OverflowException-Ursache enthalten.

Vom Indexierungsmodell aus dem Issue-Text verfasst.