Namespace creation blocked by admission controller

[micmax93]

Creating a namespace with specified labels & annotations is split into multiple requests in helmsman:
https://github.com/Praqma/helmsman/blob/master/internal/app/kube_helpers.go#L27-L29

This becomes an issue if admission controller is deployed and has policies enforcing Namespaces to have some mandatory labels, for example: pod security standard labels, Istio version or ownership.
Admission controller enforces policy on request level - in this case namespaces creation, which Helmsman performs always without any labels.

A possible solution would be to create a namespace with all attributes in a single request with kubectl apply

[micmax93]

Here is proposal on how to address this issue: #935