Add Python3 yoga unit tests

This is an automatically generated patch to ensure unit testing
is in place for all the of the tested runtimes for yoga.

See also the PTI in governance [1].

[1]: https://governance.openstack.org/tc/reference/project-testing-interface.html

Change-Id: I9c4686242a25594bb14866c137c6619d6b5d8b29

zuul.d/project.yaml

@@ -3,7 +3,7 @@
       - check-requirements
       - openstack-cover-jobs
       - openstack-lower-constraints-master-branch-jobs
-      - openstack-python3-xena-jobs
+      - openstack-python3-yoga-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check: