Change from commands helm to k8s module: metrics-server

- Install Helm plugin diff to ignore the following warning:
  [WARNING]: The default idempotency check can fail to
  report changes in certain cases. Install helm diff >= 3.4.1 for better
  results.
- Know issue for the warning:
  [WARNING]: Module did not set no_log for pass_credentials
  - ansible-collections/kubernetes.core#412

Signed-off-by: flavono123 <flavono123@gmail.com>

provisioning/roles/kubernetes/tasks/helm.yaml

@@ -17,3 +17,8 @@
     update_cache: yes
     name: helm
 
+- name: Install Helm plugin diff
+  become: yes
+  kubernetes.core.helm_plugin:
+    state: present
+    plugin_path: https://github.com/databus23/helm-diff

provisioning/roles/kubernetes/tasks/metrics_server.yaml

@@ -1,7 +1,13 @@
 - name: Add Helm repository metrics-server
   become: yes
-  command: helm repo add metrics-server https://kubernetes-sigs.github.io/metrics-server/
+  kubernetes.core.helm_repository:
+    name: metrics-server
+    repo_url: https://kubernetes-sigs.github.io/metrics-server/
 
 - name: Install Helm chart metrics-server
   become: yes
-  command: helm upgrade --install metrics-server metrics-server/metrics-server -n kube-system
+  kubernetes.core.helm:
+    state: present
+    name: metrics-server
+    chart_ref: metrics-server/metrics-server
+    release_namespace: kube-system