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/flux/flux-system/flux-installation.yaml

@@ -0,0 +1,31 @@
+---
+apiVersion: source.toolkit.fluxcd.io/v1beta2
+kind: GitRepository
+metadata:
+  name: flux-installation
+  namespace: flux-system
+spec:
+  interval: 10m
+  ref:
+    # renovate: datasource=github-releases depName=fluxcd/flux2
+    tag: v0.30.2
+  url: https://github.com/fluxcd/flux2
+  ignore: |
+    # exclude all
+    /*
+    # path to manifests
+    !/manifests
+---
+apiVersion: kustomize.toolkit.fluxcd.io/v1beta2
+kind: Kustomization
+metadata:
+  name: flux-installation
+  namespace: flux-system
+spec:
+  interval: 10m
+  path: ./manifests/install
+  prune: true
+  wait: true
+  sourceRef:
+    kind: GitRepository
+    name: flux-installation

cluster/flux/flux-system/kustomization.yaml

@@ -0,0 +1,6 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - flux-installation.yaml
+  - flux-cluster.yaml