Enable tests/windows/ in cudf.pandas tests (#15444)

closes #15424
closes #15426

In the test suite, the `window/numba` tests are skipped since they are marked `single_cpu` and these test are run with `-m not single_cpu`

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

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

URL: #15444

python/cudf/cudf/pandas/scripts/run-pandas-tests.sh

@@ -22,11 +22,7 @@ set -euo pipefail
 # of Pandas installed.
 PANDAS_VERSION=$(python -c "import pandas; print(pandas.__version__)")
 
-PYTEST_IGNORES="--ignore=tests/interchange/test_impl.py \
---ignore=tests/window/test_dtypes.py \
---ignore=tests/window/test_numba.py \
---ignore=tests/window \
---ignore=tests/plotting \
+PYTEST_IGNORES="--ignore=tests/plotting \
 --ignore=tests/tslibs/test_parsing.py \
 --ignore=tests/io/parser/common/test_read_errors.py"