Condition nova ironic test on prelaunch_test_instance

Currently nova_adoption is failing when the pre_launch.ironic
script is not executed by the development_environment role.

Let's use the same conditions, e.g. only run that test if the
pre_launch script wich set's up required flavors, images etc.

Jira: OSPRH-20021

Author: hjensas

tests/roles/nova_adoption/tasks/nova_ironic.yaml

@@ -24,6 +24,9 @@
     file: check_endpoints.yaml
 
 - name: Provision new instance on ironic
+  when:
+    - prelaunch_test_instance|bool
+    - "'pre_launch_ironic.bash' in prelaunch_test_instance_scripts"
   ansible.builtin.shell: |
     {{ shell_header }}
     {{ oc_header }}