add variant `tests` which can be one of (none, tests, benchmarks) (#17949)
add variant `tests` which can be one of (none, tests, benchmarks) (#17949)


LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack,iulian787/spack