Revert "Support kubernetes 1.22 (#258)" (#280)

This reverts commit 773b378.

## overview
Removing this as v1 CRD's breaks integration tests which are using an
old k8s client. Will save this for when we do the 1.22 upgrade in the
near future

deploy/crd.yaml

@@ -1,4 +1,4 @@
-apiVersion: apiextensions.k8s.io/v1
+apiVersion: apiextensions.k8s.io/v1beta1
 kind: CustomResourceDefinition
 metadata:
   name: flinkapplications.flink.k8s.io
@@ -12,6 +12,7 @@ spec:
     shortNames:
       - flinkapp
   scope: Namespaced
+  version: v1beta1
   versions:
     - name: v1beta1
       served: true

deploy/role-binding.yaml

@@ -1,6 +1,6 @@
 # Create a binding from Role -> ServiceAccount
 kind: ClusterRoleBinding
-apiVersion: rbac.authorization.k8s.io/v1
+apiVersion: rbac.authorization.k8s.io/v1beta1
 metadata:
   name: flinkoperator
 roleRef: