PERF(argocd): move to workers, add high priority

- Remove nodeSelector forcing control-plane placement
- Remove tolerations from ArgoCD and image-updater
- Add high-priority PriorityClass

argocd-image-updater/helm-values.yaml

@@ -17,9 +17,3 @@ resources:
     memory: 64Mi
   limits:
     memory: 64Mi
-
-# Tolerations for control-plane node
-tolerations:
-  - key: "node-role.kubernetes.io/control-plane"
-    operator: "Exists"
-    effect: "NoSchedule"