`from_any_pb` gives a useless error message when the type names don't match.

[MarkDaoust]

Environment details

• google-api-core version: pip show google-api-core = 2.19.2

Steps to reproduce

Try to decode an Any with the wrong type path.

The error is like:

TypeError: Could not convert `Any` to `PredictLongRunningResponse` 

I had to go way down in the debugger to find that the actual problem was the different versions:

TypeError: Could not convert
   Any[google.ai.generativelanguage.v1main.PredictLongRunningResponse] to
       google.ai.generativelanguage.v1beta.PredictLongRunningResponse

Code example

In this Colab example, the API doesn't know what version the client library is calling with and returns an Any with a mismatched-version.

https://colab.research.google.com/drive/1m6KLCvp2l1oD32cnIsaBLN5ecmbFNncI?resourcekey=0-hivajkhDg2FA5Sec3pTu4w&usp=sharing

Stack trace

<ipython-input-112-5c7fa9bc2888>(3)<cell line: 3>()
      1 import time
      2 
----> 3 while not op.done():
      4   time.sleep(5)
      5   print('waiting...')

  /usr/local/lib/python3.10/dist-packages/google/api_core/operation.py(174)done()
    172             bool: True if the operation is complete, False otherwise.
    173         """
--> 174         self._refresh_and_update(retry)
    175         return self._operation.done
    176 

  /usr/local/lib/python3.10/dist-packages/google/api_core/operation.py(163)_refresh_and_update()
    161         if not self._operation.done:
    162             self._operation = self._refresh(retry=retry) if retry else self._refresh()
--> 163             self._set_result_from_operation()
    164 
    165     def done(self, retry=None):

  /usr/local/lib/python3.10/dist-packages/google/api_core/operation.py(134)_set_result_from_operation()
    132 
    133             if self._operation.HasField("response"):
--> 134                 response = protobuf_helpers.from_any_pb(
    135                     self._result_type, self._operation.response
    136                 )

> /usr/local/lib/python3.10/dist-packages/google/api_core/protobuf_helpers.py(65)from_any_pb()
     63     # Unpack the Any object and populate the protobuf message instance.
     64     if not any_pb.Unpack(msg_pb):
---> 65         raise TypeError(
     66             "Could not convert {} to {}".format(
     67                 any_pb.__class__.__name__, pb_type.__name__

[ohmayr]

@MarkDaoust Thanks for filing this issue and proposing a fix. We will take a look!