CI: add option -s to pytest to enable stdout/stderr

Author: wkliao

.github/workflows/end_to_end_pytest.yml

@@ -54,4 +54,4 @@ jobs:
           export DARSHAN_NONMPI_INSTALL_PATH=$PWD/darshan_nonmpi_install
           export DARSHAN_ROOT_PATH=$PWD
           export HDF5_LIB=/usr/lib/x86_64-linux-gnu/hdf5/openmpi/libhdf5.so
-          python -m pytest darshan-test/python_runtime_tests.py
+          python -m pytest -s darshan-test/python_runtime_tests.py