helm (telegraf): add {{ .Release.Namespace }} for kustomize v5.8[01] compat

[shadow1runner]

Description

• ArgoCD v3.3 has updated to kustomize v5.8.0
• kustomize v5.8.0 has changed the way kustomize handles helmCharts: fix: Propagate Namespace correctly to Helm kubernetes-sigs/kustomize#5940 which has a nice tl;dr:

TL;DR

If you use Kustomize with Helm charts, ensure that your Helm templates explicitly set the namespace, for example:

metadata:
  namespace: {{ .Release.Namespace }}

If your charts already handle namespaces this way, this change should not introduce any breaking behavior.

Similar issues:

• helm: add {{ .Release.Namespace }} for kustomize v5.8[01] compat rustfs/rustfs#1808
• Resources should have namespace - Breaks kustomize helm deployments pajikos/home-assistant-helm-chart#156
• helm: add {{ .Release.Namespace }} for kustomize v5.8[01] compat k8up-io/k8up#1110

Expected Behavior

using kustomize build --enable-helm . renders the manifests using the proper namespaces; otherwise (when used within argocd), they might land in the default namespace (=argocd)