CI: add helm for kubelet-csr-approver/custom-cni-helm tests (#13457)

Currently this only works because helm_enabled is not actually checked
for some helm installation cases.

tests/files/debian12-custom-cni-helm.yml

@@ -20,3 +20,5 @@ custom_cni_chart_values:
     operator:
       clusterPoolIPv4PodCIDRList:
         - "{{ kube_pods_subnet }}"
+
+helm_enabled: true

tests/files/debian13-kubelet-csr-approver.yml

@@ -8,3 +8,5 @@ kubelet_csr_approver_enabled: true
 kubelet_csr_approver_values:
   # Do not check DNS resolution in testing (not recommended in production)
   bypassDnsResolution: true
+
+helm_enabled: true

tests/files/ubuntu24-calico-all-in-one-hardening.yml

@@ -75,6 +75,7 @@ etcd_deployment_type: kubeadm
 kubelet_authentication_token_webhook: true
 kube_read_only_port: 0
 kubelet_rotate_server_certificates: true
+helm_enabled: true
 kubelet_csr_approver_enabled: true # For hydrophone
 kubelet_csr_approver_values:
   # Do not check DNS resolution in testing (not recommended in production)