Switch to Spack-stack 2.0.0

[Dooruk]

New release of spack-stack is about to drop (< 2-3 x weeks). We don't need to switch immediately but could start testing once the new unified Discover environment is defined here:

https://github.com/JCSDA/spack-stack/wiki/Release-2.0.0

Our comparison suites will come in handy 😎

Python version should be the same as spack-stack 1.9.0, 3.11, according to @mathomp4

FYI @rtodling @metdyn @ftgoktas @cohen-seth

[mathomp4]

One note: There seems to be a full on compiler bug between some files in the Noah-MP physics and GCC 13.2.0 (at least at NAS). Intel seems to build fine though.