fix: Usernames now have include cluster names

templates/config.j2

@@ -7,13 +7,13 @@ clusters:
 contexts:
 - context:
     cluster: {{ cluster }}
-    user: {{ username }}
+    user: {{ username }}@{{ cluster }}
   name: {{ cluster }}
 current-context: {{ cluster }}
 kind: Config
 preferences: {}
 users:
-- name: {{ username }}
+- name: {{ username }}@{{ cluster }}
   user:
     client-certificate-data: {{ user_cert_data }}
     client-key-data: {{ user_key_data }}