feat: add KRH.delete, KRH.reconcile, and supporting helpers/tests

[ca-scribner]

Added here are features tracking, managing, and removing resources from previous executions.

This PR includes:

• new inputs labels and child_resource_types for KRH, to help with managing resources deployed previously
• KRH.get_deployed_resources(), which finds previously deployed resources in a cluster that are "owned" by this instantiation of KRH
• KRH.delete(), which deletes previously deployed resources
• KRH.reconcile(), which reconciles (deletes, modifies, and creates) previous resources to match the current desired state
• helpers and tests for the above features
• new integration tests for KRH (apply, reconcile, and delete)