Use `kpt`'s new config packaging and rendering workflows for day0 and dayN user journeys

[droot]

Now that we have a functional build for kpt, we should validate the packaging and rendering workflows through some of the customer journeys that involves day0 and dayN scenarios.

[droot]

/cc @mortent @mikebz

[mikebz]

moving to M3 so we can define what we need to cover here.