- project:
    templates:
      - check-requirements
      - lib-forward-testing-python3
      - openstack-python3-wallaby-jobs
      - periodic-stable-jobs
      - publish-openstack-docs-pti
      - release-notes-jobs-python3

- project:
    templates:
      - check-requirements
      - lib-forward-testing-python3
      - openstack-python3-xena-jobs
      - periodic-stable-jobs
      - publish-openstack-docs-pti
      - release-notes-jobs-python3

Switch testing to Xena testing runtime
Switch testing to Xena testing runtime

Upating the tetsing template to Xena testing runtime:
https://governance.openstack.org/tc/reference/runtimes/xena.html

Change-Id: I0ae4361508c60fab646ef5eabe9ac02fac8b8039
