Versioned static manifests (#8162)

* update deploy script to generate static manifests for all supported versions

* generate static manifests for all supported versions

deploy/static/provider/cloud/1.21/kustomization.yaml

@@ -0,0 +1,11 @@
+# NOTE: kustomize is not supported. This file exists only to be able to reference it from bases.
+# https://kubectl.docs.kubernetes.io/references/kustomize/bases/
+#
+# ```
+# namespace: ingress-nginx
+# bases:
+#   - github.com/kubernetes/ingress-nginx/deploy/static/provider/cloud?ref=master
+# ```
+
+resources:
+  - deploy.yaml