Support Nouveau in CHT Deploy script and upgrades and docs

[mrjones-plip]

Describe the issue
Current, the CHT Deploy script for k8s is not aware of the upcoming CHT Core Nouveau feature.

Describe the improvement you'd like
We should update the deploy script such that a happy path new deployment works when we ship CHT 4.x with Nouveau. Additionally, upgrade paths from prior versions of k8s based deployments should account for this change to ensure services don't break. This may be just documentation improvements or it maybe code additions or helm chart additions.