Purge legacy cleanup tasks from older than 1 year (#4450)

We don't need to support upgrades from 2 year old installs,
just from the last major version.

Also changed most retried tasks to 1s delay instead of longer.

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

@@ -1,15 +1,4 @@
 ---
-- name: Kubernetes Apps | Delete old kubernetes-dashboard resources
-  kube:
-    name: "kubernetes-dashboard"
-    kubectl: "{{ bin_dir }}/kubectl"
-    resource: "{{ item }}"
-    state: absent
-  with_items:
-    - 'ClusterRoleBinding'
-  tags:
-    - upgrade
-
 - name: Kubernetes Apps | Lay down dashboard template
   template:
     src: "{{ item.file }}.j2"