CASM-4349 - add remote build node capabilities.

[dlaine-hpe]

Summary and Scope

This adds the ability to define a remote build node where the IMS job is run - potentially on hardware of a different architecture than the k8s worker nodes the IMS jobs is running on.

Issues and Related PRs

• Resolves CASM-4349

Testing

Tested on:

• Mug, Baldar, Tyr

Test description:

The new system was installed via loftsman and remote jobs were run in all configurations and combinations possible.

• Were the install/upgrade-based validation checks/tests run (goss tests/install-validation doc)? N
• Were continuous integration tests run? If not, why? N
• Was upgrade tested? If not, why? Y
• Was downgrade tested? If not, why? Y
• Were new tests (or test issues/Jiras) created for this change? N

Risks and Mitigations

This is a moderate risk just with the amount of new code, but for the most part the existing workflows are not impacted.

Pull Request Checklist

• Version number(s) incremented, if applicable
• Copyrights updated
• License file intact
• Target branch correct
• CHANGELOG.md updated
• Testing is appropriate and complete, if applicable