Unconditionally disable swap

We only care to disable it (the "swapon" registered variable is not used
anywhere else.
This allows to get rid of the ignore_errors, since this was added
because swapon.stdout does not exist in check_mode (see issue kubernetes-sigs#6642).

roles/kubernetes/preinstall/tasks/0010-swapoff.yml

@@ -15,21 +15,10 @@
     masked: true
   when: "{{ ansible_service_mgr != 'systemd' }}"
 
-# kubelet fails even if ansible_swaptotal_mb = 0
-- name: Check swap
-  command: /sbin/swapon -s
-  register: swapon
-  changed_when: no
-
 - name: Disable swap
   command: /sbin/swapoff -a
-  when:
-    - swapon.stdout
-  ignore_errors: "{{ ansible_check_mode }}"  # noqa ignore-errors
 
 - name: Disable swapOnZram for Fedora
   command: touch /etc/systemd/zram-generator.conf
   when:
-    - swapon.stdout
     - ansible_distribution in ['Fedora']
-  ignore_errors: "{{ ansible_check_mode }}"  # noqa ignore-errors