[zuul] Enable ansibletest and tobiko with stages

With this PR in the test-operator role [1] we introduced the concept of
stages. By default only tempest stage is enabled. In order for us to
continue to test tobiko and ansibletest CR we have to explicitly enable
the testing via the cifmw_test_operator_stages parameter.

[1] openstack-k8s-operators/ci-framework#2374

.zuul.yaml

@@ -34,6 +34,13 @@
       # Test operator
       cifmw_test_operator_concurrency: 4
       cifmw_test_operator_timeout: 7200
+      cifmw_test_operator_stages:
+        - step: tempest
+          name: tempest
+        - step: tobiko
+          name: tobiko
+        - step: ansibletest
+          name: ansibletest
 
       # Tempest
       cifmw_run_tempest: true