Calico upgrade path validation and old version cleanup (#6733)

* calico: add constant calico_min_version_required

and verify current deployed version against it.

* calico: remove upgrade support with data migration

The tool was used pre v3.0.0 and is no longer needed.

* calico: remove old version support from tasks

* calico: remove old ver support from policy ctrl

* calico: remove old ver support from node

* canal: remove old ver support

* remove unused calicoctl download checksums

calico_min_version_required is the oldest version that can be installed
Older versions can be removed.

roles/kubernetes-apps/policy_controller/calico/templates/calico-kube-controllers.yml.j2

@@ -38,15 +38,13 @@ spec:
             requests:
               cpu: {{ calico_policy_controller_cpu_requests }}
               memory: {{ calico_policy_controller_memory_requests }}
-{% if calico_version is version('v3.3.0', '>=') %}
           readinessProbe:
             exec:
               command:
               - /usr/bin/check-status
               - -r
-{% endif %}
           env:
-{% if calico_datastore == "kdd" and calico_version is version('v3.6.0', '>=') %}
+{% if calico_datastore == "kdd" %}
             - name: ENABLED_CONTROLLERS
               value: node
             - name: DATASTORE_TYPE

roles/kubernetes-apps/policy_controller/calico/templates/calico-kube-cr.yml.j2

@@ -81,7 +81,6 @@ rules:
       - get
       - create
       - update
-{% if calico_version is version('v3.14.0', '>=') %}
   # KubeControllersConfiguration is where it gets its config
   - apiGroups: ["crd.projectcalico.org"]
     resources:
@@ -96,4 +95,3 @@ rules:
       # watch for changes
       - watch
 {% endif %}
-{% endif %}