Adding initial safeguards functionality into staging with CAI tests

[tbarnes94]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue) Feature # (details) Safeguards functionality adds a CLI flag for validate that will validate deployment manifests against safeguard constraints to ensure cluster deployments adhere to AKS best practices.

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration. Is it a breaking change which will impact consuming tool(s).

• [x] Unit Test ContainerAllowedImages
• [ ] Unit Test ContainerEnforceProbes
• [ ] Unit Test ContainerResourceLimits
• [ ] Unit Test NoUnauthenticatedPulls
• [ ] Unit Test PodDisruptionBudgets
• [ ] Unit Test PodEnforceAntiaffinity
• [ ] Unit Test RestrictedTaints
• [ ] Unit Test UniqueServiceSelectors

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules