WIP: Change deprecated kokkos-num-devices to kokkos-map-device-id for ctest

[forrestglines]

PR Summary

Apparently the kokkos command line option --kokkos-num-devices is deprecated Per Kokkos' suggestion changing this in testing to --kokkos-map-device-id-by=mpi_rank allows us to forgo specifying NUM_GPU_DEVICES_PER_NODE, making building+testing simpler.

PR Checklist

• [ ] Code passes cpplint
• [ ] New features are documented.
• [ ] Adds a test for any bugs fixed. Adds tests for new features.
• [ ] Code is formatted
• [ ] Changes are summarized in CHANGELOG.md
• [ ] CI has been triggered on Darwin for performance regression tests.
• [ ] Docs build
• [ ] (@lanl.gov employees) Update copyright on changed files

[pgrete]

Do we want to get rid of that parameter entirely? As far as I can tell it's only used in the "test precheck" as a warning, but otherwise the numbers are hardcoded to each machine in the machine file anyway.