pfunit: add max_array_rank=(int) variant (#15348)
pfunit: add max_array_rank=(int) variant (#15348)

* pfunit: add max_array_rank=(int) variant

* pfunit: flake8 line length fixes
LLNL/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack