WIP: Cleanup smith spack pkg

[chapman39]

• adds new smith version
• removes outdated/ repeated sections
• fix removing duplicates from MFEM property
  • detail: rather than removing duplicates, it was removing ALL rpaths! this breaks things if any TPLs of MFEM (e.g. hypre) were built as shared
  • TODO make separate pr(?)
  • TODO fix this in tribol...

TODO

• cleanup forwarding variants
• test forwarding with ++shared and/ or build==Debug
• add documentation somewhere on how to forward variants
• add documentation on how to add new user to remote login macmini
• update spack and spack-packages
• update caliper fixes [next tpl build] update caliper to 2.13.1 (or newer) for the alloc.stats capability #1550
• build tpls

Some problems...

if ~~shared, probably can't use certain libs as external

==> Error: failed to concretize `smith@develop+adiak+caliper+devtools+enzyme~openmp~~shared %[when='%fortran'] fortran=gcc@15 %[when='%c'] c=clang@19 %[when='%cxx'] cxx=clang@19 %[when='%mpi'] openmpi@5.0.9.clang_19` for the following reasons:
     1. Cannot build python, since it is configured `buildable:false` and no externals satisfy the request
     2. Cannot build py-sphinx, since it is configured `buildable:false` and no externals satisfy the request
     3. Cannot build lua, since it is configured `buildable:false` and no externals satisfy the request