refactor(k3s): remove system upgrade controller

More trouble than it's worth.
Update Ansible to upgrade k3s instead.

system/system-upgrade/k3s/agent.yaml

@@ -1,26 +0,0 @@
-apiVersion: upgrade.cattle.io/v1
-kind: Plan
-metadata:
-  name: k3s-agent
-  namespace: system-upgrade
-  labels:
-    k3s-upgrade: agent
-spec:
-  nodeSelector:
-    matchExpressions:
-      - key: node-role.kubernetes.io/control-plane
-        operator: DoesNotExist
-  serviceAccountName: system-upgrade
-  prepare:
-    image: rancher/k3s-upgrade
-    args:
-      - prepare
-      - k3s-server
-  concurrency: 1
-  cordon: true
-  drain:
-    force: true
-    skipWaitForDeleteTimeout: 300  # Honor PodDisruptionBudgets
-  upgrade:
-    image: rancher/k3s-upgrade
-  version: v1.27.1+k3s1

system/system-upgrade/k3s/kustomization.yaml

@@ -1,10 +0,0 @@
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-
-resources:
-  - server.yaml
-  - agent.yaml
-
-commonAnnotations:
-  # TODO https://github.com/rancher/system-upgrade-controller/issues/172
-  argocd.argoproj.io/sync-options: SkipDryRunOnMissingResource=true

system/system-upgrade/k3s/server.yaml

@@ -1,21 +0,0 @@
-apiVersion: upgrade.cattle.io/v1
-kind: Plan
-metadata:
-  name: k3s-server
-  namespace: system-upgrade
-  labels:
-    k3s-upgrade: server
-spec:
-  nodeSelector:
-    matchExpressions:
-      - key: node-role.kubernetes.io/control-plane
-        operator: Exists
-  serviceAccountName: system-upgrade
-  concurrency: 1
-  cordon: true
-  drain:
-    force: true
-    skipWaitForDeleteTimeout: 300  # Honor PodDisruptionBudgets
-  upgrade:
-    image: rancher/k3s-upgrade
-  version: v1.27.1+k3s1

system/system-upgrade/kustomization.yaml

@@ -1,6 +0,0 @@
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-
-resources:
-  - https://github.com/rancher/system-upgrade-controller/releases/download/v0.8.1/system-upgrade-controller.yaml
-  - k3s