Move S4 and Gaea C5 from tier 1 to tier 2; clean up site config modules.yaml files; bug fix in util/nrl/batch_install.sh

[climbfuji]

Description

1. Move S4 and Gaea C5 from tier 1 to tier 2.
2. Clean up all site config modules.yaml files: remove unnecessary include:python. This is a relic from the past when we used external Python installations with Spack and had exclude:python in configs/common/modules.yaml. That entry has been removed a long time ago, and the include:python statements are no longer necessary.
3. Bug fix in util/nrl/batch_install.sh: When spack creates a bootstrap mirror, it populates the spack scope with compilers and packages it finds, which can create problems later. Remove these files.

Dependencies

None

Issues addressed

Working toward #1883

Applications affected

None

Systems affected

S4, Gaea C5

Testing

• CI: Note whether the automatic tests (GitHub actions tests that run automatically for every commit) pass or not
  • GitHub actions CI tests pass
  • GitHub actions CI tests do not pass (provide explanation)
  • GitHub actions CI tests skipped (provide explanation if necessary)
• New tests added: List and describe any new tests added to GitHub actions
  • ...
• Additional testing: Add information on any additional tests conducted
  • Built all spack-stack environments on Atlantis and ran NEPTUNE regression tests against them

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.
• All necessary updates to the documentation (spack-stack wiki) will be made when this PR is merged

[AlexanderRichert-NOAA]

What are the impetus and implications for moving Gaea C5 to tier 2 status?

[climbfuji]

What are the impetus and implications for moving Gaea C5 to tier 2 status?

EPIC management decided (in accordance with whom?) last year that C5 would no longer be supported as a tier 1 platform. In fact, the last release(s) of spack-stack weren't deployed there. Gaea C6 remains fully supported.

@rickgrubin-noaa knows more.

[AlexanderRichert-NOAA]

Ok fair enough, thanks