fix: revert namespace back to the ntnx-system

The Helm chart does not propagate the required env/arg with the namespace,
and it does not support setting extra args/envs.

Author: dkoshkin

hack/addons/kustomize/nutanix-snapshot-csi/kustomization.yaml.tmpl

@@ -16,4 +16,3 @@ helmCharts:
   version: ${NUTANIX_SNAPSHOT_CSI_CHART_VERSION}
   includeCRDs: true
   skipTests: true
-  namespace: kube-system

hack/addons/kustomize/nutanix-storage-csi/kustomization.yaml.tmpl

@@ -16,4 +16,3 @@ helmCharts:
   version: ${NUTANIX_STORAGE_CSI_CHART_VERSION}
   includeCRDs: true
   skipTests: true
-  namespace: kube-system

pkg/handlers/generic/lifecycle/csi/nutanix/handler.go

@@ -21,10 +21,10 @@ import (
 
 const (
 	defaultStorageHelmReleaseName      = "nutanix-csi"
-	defaultStorageHelmReleaseNamespace = "kube-system"
+	defaultStorageHelmReleaseNamespace = "ntnx-system"
 
 	defaultSnapshotHelmReleaseName      = "nutanix-csi-snapshot"
-	defaultSnapshotHelmReleaseNamespace = "kube-system"
+	defaultSnapshotHelmReleaseNamespace = "ntnx-system"
 
 	//nolint:gosec // Does not contain hard coded credentials.
 	defaultCredentialsSecretName = "nutanix-csi-credentials"