Enable reserved variable name checks and fix violations (#12463)

* Enable reserved variable name checks and fix violations

Updated .ansible-lint configuration to skip only var-naming[pattern]
and var-naming[no-role-prefix] instead of skipping the entire var-naming rule.
This enables the check for reserved variable names.

Renamed variables that used reserved names to avoid conflicts.
Updated all references in tasks, variables, and templates.

Signed-off-by: Ali Afsharzadeh <afsharzadeh8@gmail.com>

* Rename namespace variable inside tasks instead of deleting it

Signed-off-by: Ali Afsharzadeh <afsharzadeh8@gmail.com>

* Change hosts variable to vm_hosts

Signed-off-by: Ali Afsharzadeh <afsharzadeh8@gmail.com>

* Use k8s_namespace instead of dashboard_namespace in dashboard.yml.j2 template

Signed-off-by: Ali Afsharzadeh <afsharzadeh8@gmail.com>

---------

Signed-off-by: Ali Afsharzadeh <afsharzadeh8@gmail.com>

roles/kubernetes-apps/ansible/tasks/main.yml

@@ -95,7 +95,7 @@
   delegate_to: "{{ groups['kube_control_plane'][0] }}"
   run_once: true
   vars:
-    namespace: "{{ netcheck_namespace }}"
+    k8s_namespace: "{{ netcheck_namespace }}"
   when: deploy_netchecker
   tags:
     - netchecker
@@ -117,7 +117,7 @@
   delegate_to: "{{ groups['kube_control_plane'][0] }}"
   run_once: true
   vars:
-    namespace: "{{ dashboard_namespace }}"
+    k8s_namespace: "{{ dashboard_namespace }}"
   when: dashboard_enabled
   tags:
     - dashboard