Closes #16303: Julia build fails with "ERROR: Invalid CPU name skylake_avx512."  (#18745)
Closes #16303: Julia build fails with "ERROR: Invalid CPU name skylake_avx512."  (#18745)

* Fix 'Invalid CPU name' error for skylake avx512 #16303

* Change new julia versions to use tarballs

* Remove setting of MARCH
LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack