Add gittools as varant to neptune-python-env/neptune-dev, add rank-run to base-env

[climbfuji]

Description

1. Add gittools variant (gh, py-pygithub) to neptune-python-env and enable in neptune-dev template. I couldn't enable it in the unified-dev template for oneapi, because the concretizer ended up in an infinite loop, heating my room overnight but not concretizing the environment.
2. Add rank-run to base-env.
3. Add external bash to all DOD HPCMP systems (required by gh --> go, don't want to build bash!), also find in GitHub workflows (I checked that it is being found and used).
4. Fix bug in .gitmodules: unintentional leftover from previous PR that didn't revert the spack submodule pointer information.

Dependencies

• Waiting on Add py-pygithub@2.8.1, new package rank-run spack-packages#36

Issues addressed

Closes #1805
Closes #1727

Applications affected

NEPTUNE

Systems affected

NRL systems

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
  • ...

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

[climbfuji]

I only added the bash external. The other, non-visible changes are because the line endings changed from Windows to Unix.

[AlexanderRichert-NOAA]

Which applications use rank-run? Is it needed for UFS Weather Model?