Fix a mask data corruption in UDF (rapidsai#12647)

This PR fixes a mask data corruption issue encountered while working on rapidsai#12619.

`column_empty` actually returns un-initialized values, but we would want a fully initialized mask column here. Hence it is very inconsistent to test for a failure here, which is the reason it has been passing in CI and many of the local builds.

Authors:
  - GALI PREM SAGAR (https://github.com/galipremsagar)

Approvers:
  - https://github.com/brandon-b-miller
  - Ashwin Srinath (https://github.com/shwina)

URL: rapidsai#12647

python/cudf/cudf/core/indexed_frame.py

@@ -2124,7 +2124,9 @@ def _apply(self, func, kernel_getter, *args, **kwargs):
 
         # Mask and data column preallocated
         ans_col = _return_arr_from_dtype(retty, len(self))
-        ans_mask = cudf.core.column.column_empty(len(self), dtype="bool")
+        ans_mask = cudf.core.column.full(
+            size=len(self), fill_value=True, dtype="bool"
+        )
         output_args = [(ans_col, ans_mask), len(self)]
         input_args = _get_input_args_from_frame(self)
         launch_args = output_args + input_args + list(args)