Turn on parallel CI tests in Autotools & CMake

[derobins]

Does not turn parallel CI on in NVHPC, etc. - just the main yml files.

[byrnHDF]

For CMake you can easily use the REGEX form to run serial then parallel - Larry does it for HPC

[derobins]

For CMake you can easily use the REGEX form to run serial then parallel - Larry does it for HPC

Maybe we can start by running parallel tests just in CMake