Workaround for current CI issues with clang14 on MacOS

[franzpoeschel]

All CI runs for appleclang14_py_mpi_h5_ad2 are currently failing and this looks like a bug in mpiexec to me.
This tries a workaround.

The error:

...

2023-11-28T10:53:38.1264050Z 27: --------------------------------------------------------------------------
2023-11-28T10:53:38.1265160Z 27: An unrecognized option was included on the mpiexec command line:
2023-11-28T10:53:38.1265740Z 27: 
2023-11-28T10:53:38.1266110Z 27:   Option: --infile
2023-11-28T10:53:38.1266410Z 27: 
2023-11-28T10:53:38.1266940Z 27: Please use the "mpiexec --help" command to obtain a list of all
2023-11-28T10:53:38.1267520Z 27: supported options.
2023-11-28T10:53:38.1268080Z 27: --------------------------------------------------------------------------
2023-11-28T10:53:38.1271700Z 27/40 Test #27: CLI.pipe.py .................................***Failed    0.03 sec

...

2023-11-28T10:53:39.7926460Z 33: --------------------------------------------------------------------------
2023-11-28T10:53:39.7927270Z 33: An unrecognized option was included on the mpiexec command line:
2023-11-28T10:53:39.7927830Z 33: 
2023-11-28T10:53:39.7928140Z 33:   Option: -m
2023-11-28T10:53:39.7928420Z 33: 
2023-11-28T10:53:39.7928970Z 33: Please use the "mpiexec --help" command to obtain a list of all
2023-11-28T10:53:39.7929540Z 33: supported options.
2023-11-28T10:53:39.7930100Z 33: --------------------------------------------------------------------------
2023-11-28T10:53:39.7930850Z 33/40 Test #33: Example.py.4_read_parallel ..................***Failed    0.02 sec

...

2023-11-28T10:53:39.8126700Z 34: --------------------------------------------------------------------------
2023-11-28T10:53:39.8127470Z 34: An unrecognized option was included on the mpiexec command line:
2023-11-28T10:53:39.8128040Z 34: 
2023-11-28T10:53:39.8128360Z 34:   Option: -m
2023-11-28T10:53:39.8128640Z 34: 
2023-11-28T10:53:39.8129180Z 34: Please use the "mpiexec --help" command to obtain a list of all
2023-11-28T10:53:39.8129760Z 34: supported options.
2023-11-28T10:53:39.8130740Z 34: --------------------------------------------------------------------------
2023-11-28T10:53:39.8131570Z 34/40 Test #34: Example.py.5_write_parallel .................***Failed    0.02 sec

...

2023-11-28T10:53:45.0888290Z The following tests FAILED:
2023-11-28T10:53:45.0890320Z 	 27 - CLI.pipe.py (Failed)
2023-11-28T10:53:45.0891220Z 	 33 - Example.py.4_read_parallel (Failed)
2023-11-28T10:53:45.0892090Z 	 34 - Example.py.5_write_parallel (Failed)

Happens always when the subcommand that is launched via mpiexec contains an argument starting with a dash, so this is probably a parser error in mipexec.

[franzpoeschel]

The last commit ensures that the CI fails again as soon as the parser bug is fixed. The wrapper used as a workaround will fail as soon as mpiexec starts behaving correctly again.