Invoke ctest -j1 from spack install --test, and build_with_parsec from spack test run (#22070)
Invoke ctest -j1 from spack install --test, and build_with_parsec from spack test run (#22070)

Signed-off-by: Aurelien Bouteiller <ac358fa4b02ae043c59dde79b280be5ec22b99f9@icl.utk.edu>
LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack