All in-cluster components should be installed using kpt

[bgrant0607]

Porch, Backstage, Config Sync.

Installation instructions don't use kpt. https://kpt.dev/installation/

Porch downloads a tarball and does kubectl apply. https://kpt.dev/guides/porch-installation?id=run-released-version-of-porch

Config Sync is similar: https://github.com/GoogleContainerTools/kpt-config-sync/blob/main/docs/installation.md#installing-a-released-version

The Backstage plugin doesn't have a comparable release yet.