refactor(cluster)!: Update flux installation and upgrade method

Other changes include:
- Rename cluster/base to cluster/flux
- Add config and charts fluxtomizations
- Update scripts and taskfiles to reflect changes

cluster/config/kustomization.yaml

@@ -0,0 +1,5 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - cluster-settings.yaml
+  - cluster-secrets.sops.yaml