fix: helm before rke2 managed manifests

- add fact to list namespaces
- require namespace before adding additional config
- renamed some files to better match what they are

modules/rke2/lib/facter/k8s_namespaces.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+require 'json'
+require 'open3'
+
+Facter.add(:k8s_namespaces) do
+  confine do
+    File.exist?('/etc/rancher/rke2/rke2.yaml') &&
+      File.executable?('/usr/bin/kubectl') # Adjust this path if needed
+  end
+
+  setcode do
+    env = { 'KUBECONFIG' => '/etc/rancher/rke2/rke2.yaml' }
+    cmd = ['/usr/bin/kubectl', 'get', 'namespaces', '-o', 'json']
+
+    stdout, stderr, status = Open3.capture3(env, *cmd)
+
+    if status.success?
+      json = JSON.parse(stdout)
+      json['items'].map { |item| item['metadata']['name'] }
+    else
+      Facter.debug("kubectl error: #{stderr}")
+      []
+    end
+  rescue StandardError => e
+    Facter.debug("Exception in k8s_namespaces fact: #{e.message}")
+    []
+  end
+end