On NRL sites, use OS zlib instead of spack-built zlib-ng

[climbfuji]

Summary

This PR updates all NRL sites to use the OS libz.so instead of the spack-built zlib-ng version. This is to address numerous problems, especially on Cray, where after loading spack-stack environments, basic tools like less and more sophisticated tools like ddt would throw many warnings or even stop working. For consistency, we do this on all NRL systems, regardless of being a Cray or not.

Included are also:

• Additional, minor updates to the NRL site configs, most notably the update of cray-mpich on Narwhal to the latest version 8.1.26.
• In template neptune-dev, exclude neptune-python-env with Intel Classic compilers. Yes, the time has come to say goodbye. The new versions of Python packages py-numpy and py-scipy don't build with these compilers, and it's not worth fixing those builds given that these compilers are deprecated and the replacement (%oneapi with icx, icpx, ifort) works fine.
• Turn off gssapi variant for package libtircp because of a build error with latest OneAPI compilers (libtircp only needed by hdf@4, and the variant isn't needed)

This PR requires a bugfix/workaround in spack for package freetype, see JCSDA/spack#496

Testing

• CI
• Bounty (@climbfuji's dev box, Almalinux 9, [email protected], neptune-dev)
• Atlantis
• Nautilus
• Narwhal

Applications affected

NEPTUNE applications running on NRL systems

Systems affected

NRL systems

Dependencies

• waiting on Workaround for freetype build error with external libz and spack-built pkg-config spack#496

Issue(s) addressed

Resolves numerous issue in the NRL Enterprise GitHub related to using spack's zlib-ng.

Resolves #1441

Checklist

• This PR addresses one issue/problem/enhancement, or has a very good reason for not doing so.
• These changes have been tested on the affected systems and applications.
• All dependency PRs/issues have been resolved and this PR can be merged.

[climbfuji]

The blueback site config will be split into separate site configs for TDS cole, tusk in a follow-up PR.