[update] Restrict post-services split update tests to tempest only

During a split update, the continuous control plane check runs
in the background creating and deleting VMs in a loop. When
tobiko tests run in the intermediate post-services test stage,
they may encounter these transient VMs in BUILD state, causing
non-deterministic failures (HTTP 409 Conflict / HTTP 404).

Override cifmw_test_operator_stages in the post-services test
task to run only tempest, excluding tobiko from the intermediate
stage. Tobiko continues to run in the final post-update test
stage (in update-edpm.yml), after the control plane check has
been stopped.

Closes: OSPCIX-1381
Signed-off-by: Vito Castellano <vcastell@redhat.com>

Author: Valkyrie00

roles/update/tasks/update_variant_split.yml

@@ -24,6 +24,9 @@
   vars:
     cifmw_test_operator_artifacts_basedir: "{{ cifmw_basedir }}/tests/test_operator_update"
     cifmw_test_operator_tempest_name: "post-services-update-tempest-tests"
+    cifmw_test_operator_stages:
+      - name: tempest
+        type: tempest
   ansible.builtin.include_role:
     name: cifmw_setup
     tasks_from: run_tests.yml