Gallery example scripts should not write files within pyfluent directory

[mkundu1]

This will avoid CI errors like:

Error: File was unable to be removed Error: EACCES: permission denied, unlink '/home/ansys/actions-runner/_work/pyfluent/pyfluent/wing_workflow_files/TaskObject11.msh.h5'

Currently we need to login into the runner and delete the file with sudo.

[mkundu1]

More errors:

ansys@pyfluent-ci-2:~$ rm -rf /home/ansys/actions-runner/_work/pyfluent/pyfluent
rm: cannot remove '/home/ansys/actions-runner/_work/pyfluent/pyfluent/wing_workflow_files/TaskObject11.msh.h5': Permission denied
rm: cannot remove '/home/ansys/actions-runner/_work/pyfluent/pyfluent/wing_workflow_files/wing.wft': Permission denied
rm: cannot remove '/home/ansys/actions-runner/_work/pyfluent/pyfluent/wing_workflow_files/wing.sf': Permission denied
rm: cannot remove '/home/ansys/actions-runner/_work/pyfluent/pyfluent/wing_workflow_files/TaskObject3.msh.h5': Permission denied
rm: cannot remove '/home/ansys/actions-runner/_work/pyfluent/pyfluent/FM_a0d90178945e_208/TaskObject11.msh.h5': Permission denied
rm: cannot remove '/home/ansys/actions-runner/_work/pyfluent/pyfluent/FM_a0d90178945e_208/wing.sf': Permission denied
rm: cannot remove '/home/ansys/actions-runner/_work/pyfluent/pyfluent/FM_a0d90178945e_208/TaskObject3.msh.h5': Permission denied

[mkundu1]

OTOH, we don't want to complicate the example scripts. The permission issue here seems to be a valid issue, which should not normally happen.