Add example of building Slurm on top of Rocky 8

[nick-stroud]

Builds the latest Slurm V6 image on top of HPC Rocky 8 image and deploys a simple cluster using the image. This example is meant to be a demonstrator to show how it is possible to build Slurm.

Notes:

• This calls ansible directly instead of using Slurm Packer module to avoid complexity of importing external Packer module.
• This does custom ansible install instead of using ansible runner as python upgrade breaks selinux bindings when done from within a virtual environment.

Tested:

• Manually run blueprint and test how cluster (srun hostname).
• Added integration test that does deploy/destroy

Submission Checklist

Please take the following actions before submitting this pull request.

• Fork your PR branch from the Toolkit "develop" branch (not main)
• Test all changes with pre-commit in a local branch #
• Confirm that "make tests" passes all tests
• Add or modify unit tests to cover code changes
• Ensure that unit test coverage remains above 80%
• Update all applicable documentation
• Follow Cloud HPC Toolkit Contribution guidelines #

[nick-stroud]

To Reviewer: I will add documentation and integration test once you have given a first pass approval of the methodology of the blueprint.

[nick-stroud]

I submitted test manually (build 4c971653-eee2-45f3-8d9c-1cb7c2634145) and it is passing.
I will update triggers once it is submitted.