Static manifest generation uses kustomize instead of python (#8099)

* regenerate at 4.0.12

* bash for loop and static values files

* add .tool-versions

* fixup static manifests with kustomize instead of python

* remove spec.replicas where set

* generate manifests for all supported versions

* update docs

* remove all versions except default (1.20) for now

* update to 1.1.1/4.0.15

hack/manifest-templates/common/kustomization.yaml

@@ -0,0 +1,14 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- manifest.yaml
+- namespace.yaml
+
+patches:
+- target:
+    group: apps
+    version: v1
+    kind: Deployment
+  patch: |-
+    - op: remove
+      path: /spec/replicas

hack/manifest-templates/common/namespace.yaml

@@ -0,0 +1,7 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: ingress-nginx
+  labels:
+    app.kubernetes.io/name: ingress-nginx
+    app.kubernetes.io/instance: ingress-nginx