chore: materialize result of remote_function early (#408)

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
- [ ] Make sure to open an issue as a [bug/issue](https://togithub.com/googleapis/python-bigquery-dataframes/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)

Fixes internal issue 327662690 🦕

Author: shobsi

bigframes/series.py

@@ -1253,11 +1253,17 @@ def apply(
                     ex.message += f"\n{_remote_function_recommendation_message}"
                 raise
 
+        # We are working with remote function at this point
         reprojected_series = Series(self._block._force_reproject())
-        return reprojected_series._apply_unary_op(
+        result_series = reprojected_series._apply_unary_op(
             ops.RemoteFunctionOp(func=func, apply_on_null=True)
         )
 
+        # return Series with materialized result so that any error in the remote
+        # function is caught early
+        materialized_series = result_series._cached()
+        return materialized_series
+
     def add_prefix(self, prefix: str, axis: int | str | None = None) -> Series:
         return Series(self._get_block().add_prefix(prefix))